Read a RemoteConfig instance

[jeromy-cannon]

• design: Create design for RemoteConfig #657
• list of mutable commands: Create design for RemoteConfig #657 (comment)
• See: details about schema generator in: Create a Local Config for storing configurations on the users machine #590
• NOTES:
  • The RemoteConfig Kubernetes ConfigMap which is namespace specific will be called solo-remote-config with a label of solo.hedera.com/type: remote-config
  • The read should be called within the inject: Inject a RemoteConfig instance #773

Feature: read a RemoteConfig instance

  The RemoteConfig instance will be read from a Kubernetes ConfigMap. 
It will be stored as YAML in the Kubernetes ConfigMap.  
It will be parsed from YAML to JSON, then validated against a JSON Schema.  
The JSON Schema is created from a JSON Schema generator from the TypeScript class.  
A populated instance of the TypeScript class will be returned as a result of reading the RemoteConfig.

  Scenario: no RemoteConfig found for the given namespace/cluster/context 
    Given the namespace, cluster, and context
    When looking for the RemoteConfig
    And it is not found
    Then a SoloError will be thrown explaining for the given namespace/cluster/context that no RemoteConfig ConfigMap was found

  Scenario: a RemoteConfig is found but fails to be converted from YAML to JSON (invalid YAML)
    Given the namespace, cluster, and context
    When looking for the RemoteConfig 
    And one is found
    And an error occurs while trying to parse the YAML into JSON
    Then a SoloEror will be thrown explaining that for the given namespace/cluster/context that the RemoteConfig ConfigMap was found invalid and must be manually corrected

  Scenario: a RemoteConfig is found but fails the JSON Schema validation
    Given the namespace, cluster, and context
    When looking for the RemoteConfig 
    And one is found
    And successfully returns a JSON while parsing the YAML
    And fails the JSON schema validation with an error
    Then a SoloEror will be thrown explaining that for the given namespace/cluster/context that the RemoteConfig ConfigMap was found invalid due to a schema validation error
    And provide in the error the schema validation error
    And let the user know that it must be manually corrected

  Scenario: a RemoteConfig is found and a populated class instance is returned
    Given the namespace, cluster, and context
    When looking for the RemoteConfig 
    And one is found
    And successfully returns a JSON while parsing the YAML
    And passes the JSON schema validation
    Then the RemoteConfig will be populated with elements from the YAML
    And the read function will return true

  Scenario: when a `npm run build` occurs, a JSON schema will be created for the RemoteConfig
    Given `npm run build` is ran 
    When `generate-schema` in `package.json` script is ran
    Then it will generate a 'local-config.json' schema file