feat: [connectgateway] new module for connectgateway

[cloud-java-bot]

Generated by @mpeddada1 via generate_new_client_hermetic_build.yaml

Command used:

python generation/new_client_hermetic_build/add-new-client-config.py add-new-client --api-shortname "connectgateway" --name-pretty "Connect Gateway API" --api-description "The Connect Gateway service allows connectivity from external parties to     connected Kubernetes clusters." --proto-path "google/cloud/gkeconnect/gateway/v1" --product-docs "https://cloud.google.com/kubernetes-engine/enterprise/multicluster-management/gateway" 

PiperOrigin-RevId: 665564055

[snippet-bot]

Here is the summary of changes.

You are about to add 7 region tags.

• java-connectgateway/samples/snippets/generated/com/google/cloud/gkeconnect/gateway/v1/gatewaycontrol/create/SyncCreateSetCredentialsProvider.java:19, tag connectgateway_v1_generated_GatewayControl_Create_SetCredentialsProvider_sync
• java-connectgateway/samples/snippets/generated/com/google/cloud/gkeconnect/gateway/v1/gatewaycontrol/create/SyncCreateSetCredentialsProvider1.java:19, tag connectgateway_v1_generated_GatewayControl_Create_SetCredentialsProvider1_sync
• java-connectgateway/samples/snippets/generated/com/google/cloud/gkeconnect/gateway/v1/gatewaycontrol/create/SyncCreateSetEndpoint.java:19, tag connectgateway_v1_generated_GatewayControl_Create_SetEndpoint_sync
• java-connectgateway/samples/snippets/generated/com/google/cloud/gkeconnect/gateway/v1/gatewaycontrol/generatecredentials/AsyncGenerateCredentials.java:19, tag connectgateway_v1_generated_GatewayControl_GenerateCredentials_async
• java-connectgateway/samples/snippets/generated/com/google/cloud/gkeconnect/gateway/v1/gatewaycontrol/generatecredentials/SyncGenerateCredentials.java:19, tag connectgateway_v1_generated_GatewayControl_GenerateCredentials_sync
• java-connectgateway/samples/snippets/generated/com/google/cloud/gkeconnect/gateway/v1/gatewaycontrolsettings/generatecredentials/SyncGenerateCredentials.java:19, tag connectgateway_v1_generated_GatewayControlSettings_GenerateCredentials_sync
• java-connectgateway/samples/snippets/generated/com/google/cloud/gkeconnect/gateway/v1/stub/gatewaycontrolstubsettings/generatecredentials/SyncGenerateCredentials.java:19, tag connectgateway_v1_generated_GatewayControlStubSettings_GenerateCredentials_sync

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