Revert "delete eventgrid" (Azure#21512)

* Revert "delete eventgrid (Azure#21509)"

This reverts commit 700dc5e.

* Update ci.yml

* Update CHANGELOG.md

sdk/eventgrid/azure-eventgrid/CHANGELOG.md

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+# Release History
+
+## 4.6.1 (Unreleased)
+
+### Features Added
+
+### Breaking Changes
+
+### Bugs Fixed
+
+### Other Changes
+
+## 4.6.0 (2021-10-05)
+
+### Features Added
+
+- Added new enum values to `SystemEvents`.
+
+## 4.5.0 (2021-08-10)
+
+### Features Added
+
+- Added a new enum value `Microsoft.ContainerService.NewKubernetesVersionAvailable` to `SystemEvents`.
+- Added a `from_json` method which now accepts storage QueueMessage, eventhub's EventData or ServiceBusMessage or simply json bytes to return an `EventGridEvent`
+
+## 4.4.0 (2021-07-19)
+
+- Bumped `msrest` dependency to `0.6.21` to align with mgmt package.
+
+### Features Added
+
+- `EventGridPublisherClient` now supports Azure Active Directory (AAD) for authentication.
+
+## 4.3.0 (2021-06-09)
+
+  **New Features**
+  - Added new event names related to blob inventory to the `SystemEventNames` enum.
+
+  **Bug Fixes**
+  - Replaced the `ServiceBusDeadletterMessagesAvailableWithNoListenerEventName` with the right value.
+
+## 4.2.0 (2021-05-12)
+
+  **New Features**
+  - Added new event names to the `SystemEventNames` enum.
+
+## 4.1.1 (2021-04-07)
+
+  **Bug Fixes**
+  - Improved the `repr` on `EventGridEvent` to show more meaningful text.
+
+## 4.1.0 (2021-03-23)
+
+  **New Features**
+  - Added new SystemEventNames `AcsChatThreadParticipantRemovedEventName`, `AcsChatThreadParticipantAddedEventName` and `AcsRecordingFileStatusUpdatedEventName`.
+
+## 4.0.0 (2021-03-09)
+
+  **Note:** This is the first stable release of our efforts to create a user-friendly and Pythonic client library for Azure EventGrid. Users migrating from `v1.x` are advised to view the [migration guide](https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/eventgrid/azure-eventgrid/migration_guide.md).
+
+  **New Features**
+  - `azure-eventgrid` package now supports `azure.core.messaging.CloudEvent` which honors the CNCF CloudEvent spec.
+  - `azure.eventgrid.SystemEventNames` can be used to get the event model type mapping for system events.
+  - Implements the `EventGridPublisherClient` for the publish flow for EventGrid Events, CloudEvents and Custom schema events.
+
+  **Breaking Changes**
+  - `azure.eventgrid.models` namespace along with all the models in it are now removed.:
+      - JSON documentation on the events is available here: https://docs.microsoft.com/azure/event-grid/system-topics
+      - `azure.eventgrid.SystemEventNames` provides the list of available events name for easy switching.
+  - `azure.eventgrid.event_grid_client.EventGridClient` is now removed in favor of `azure.eventgrid.EventGridPublisherClient`.
+  - `azure.eventgrid.event_grid_client.EventGridClientConfiguration` is now removed.
+
+
+## 2.0.0 (2021-03-09)
+
+  **Disclaimer:** v2.0.0 is functionally equivalent to v4.0.0. Users are advised to use v4.0.0 instead of this.
+
+  **Breaking Changes**
+  - `~azure.eventgrid.CloudEvent` is now removed in favor of `~azure.core.messaging.CloudEvent`.
+  - All the `SystemEventNames` related to Azure Communication Service starting with `ACS****` are renamed to `Acs***` to honor pascal case.
+
+  **Features**
+  - Added support for two new `SystemEvents` - `ServiceBusDeadletterMessagesAvailablePeriodicNotificationsEventData` and `ServiceBusActiveMessagesAvailablePeriodicNotificationsEventData`
+
+## 2.0.0b5 (2021-02-10)
+
+  **Breaking Changes**
+  - `EventGridSharedAccessSignatureCredential` is deprecated in favor of `AzureSasCredential`.
+  - `azure.eventgrid.models` namespace along with all the models in it are now removed. `azure.eventgrid.SystemEventNames` can be used to get the event model type mapping.
+  - `topic_hostname` is renamed to `endpoint` in the `EventGridPublisherClient`.
+  - `azure.eventgrid.generate_shared_access_signature` method is now renamed to `generate_sas`.
+  - `EventGridConsumer`is now removed. Please see the samples to see how events can be deserialized.
+  - `CustomEvent` model is removed. Dictionaries must be used to send a custom schema.
+
+  **Bug Fixes**
+  - `EventGridEvent` has two additional required positional parameters namely, `data` and `data_version`.
+  - `EventGridPublisherClient` now appropriately throws a `ValueError` if an invalid credential is passed during initialization.
+
+## 2.0.0b4 (2020-11-11)
+
+  **Bug Fixes**
+  - `TypeError` is raised when bytes are passed to an `EventGridEvent`.
+
+## 2.0.0b3 (2020-10-05)
+
+  **Feature**
+  - Added support for Keyvault Event Types
+  - Added distributed tracing support for CloudEvents
+
+## 2.0.0b2 (2020-09-24)
+
+  **Features**
+  - Added support for Azure Communication Services event types.
+
+## 2.0.0b1 (2020-09-08)
+
+  **Features**
+  - Version (2.0.0b1) is the first preview of our efforts to create a user-friendly and Pythonic client library for Azure EventGrid.
+  For more information about this, and preview releases of other Azure SDK libraries, please visit https://azure.github.io/azure-sdk/releases/latest/python.html.
+  - Added Support for `CloudEvents`.
+  - Implements the `EventGridPublisherClient` for the publish flow for EventGrid Events, CloudEvents and CustomEvents.
+  - Implements the `EventGridConsumer` for the consume flow of the events.
+
+## 1.3.0 (2019-05-20)
+
+  - Event Schemas for new event types from IotHub, Media Services,
+    Container Registry, Maps, and AppConfiguration services.
+
+## 1.2.0 (2018-08-28)
+
+  - Event Schemas for new events (IotHub DeviceConnected and
+    DeviceDisconnected events, Resource events related to actions), and
+    breaking changes to the schema for IotHub DeviceCreated event and
+    IotHub DeviceDeleted event.
+
+## 1.1.0 (2018-05-24)
+
+  - Event Schemas for EventGrid subscription validation event, Azure
+    Media events, and ServiceBus events.
+
+## 1.0.0 (2018-04-26)
+
+**General Breaking changes**
+
+This version uses a next-generation code generator that *might*
+introduce breaking changes.
+
+  - Model signatures now use only keyword-argument syntax. All
+    positional arguments must be re-written as keyword-arguments. To
+    keep auto-completion in most cases, models are now generated for
+    Python 2 and Python 3. Python 3 uses the "*" syntax for
+    keyword-only arguments.
+  - Enum types now use the "str" mixin (class AzureEnum(str, Enum)) to
+    improve the behavior when unrecognized enum values are encountered.
+    While this is not a breaking change, the distinctions are important,
+    and are documented here:
+    <https://docs.python.org/3/library/enum.html#others> At a glance:
+      - "is" should not be used at all.
+      - "format" will return the string value, where "%s" string
+        formatting will return `NameOfEnum.stringvalue`. Format syntax
+        should be prefered.
+  - New Long Running Operation:
+      - Return type changes from
+        `msrestazure.azure_operation.AzureOperationPoller` to
+        `msrest.polling.LROPoller`. External API is the same.
+      - Return type is now **always** a `msrest.polling.LROPoller`,
+        regardless of the optional parameters used.
+      - The behavior has changed when using `raw=True`. Instead of
+        returning the initial call result as `ClientRawResponse`,
+        without polling, now this returns an LROPoller. After polling,
+        the final resource will be returned as a `ClientRawResponse`.
+      - New `polling` parameter. The default behavior is
+        `Polling=True` which will poll using ARM algorithm. When
+        `Polling=False`, the response of the initial call will be
+        returned without polling.
+      - `polling` parameter accepts instances of subclasses of
+        `msrest.polling.PollingMethod`.
+      - `add_done_callback` will no longer raise if called after
+        polling is finished, but will instead execute the callback right
+        away.
+
+**Features**
+
+  - Client class can be used as a context manager to keep the underlying
+    HTTP session open for performance
+  - Support for consuming Azure Container Registry events and Azure IoT
+    Hub events published to Event Grid.
+
+## 0.1.0 (2018-01-30)
+
+  - Initial Release

sdk/eventgrid/azure-eventgrid/MANIFEST.in

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+recursive-include tests *.py *.yaml
+recursive-include samples *.py
+include *.md
+include azure/__init__.py
+include azure/eventgrid/py.typed