iothub: Support Identity-Based Endpoint

[myc2h6o]

Cont. of #14354. Adding support for identity-based authentication to custom routing endpoint of iot hub. There are four endpoint resources and the main iot_hub resource. Fix #9139

• eventhub, servicebus_queue and servicebus_topic
  • authentication_type: whether to use keyBased(default) or identityBased
  • identity_id: user-assigned managed identity id when using identityBased
  • endpoint_uri and entity_path: set together, to specify the target endpoint in identityBased case
  • connection_string: update from Required to Optional, this is used in keyBased case
• storage_container
  • authentication_type, identity_id, endpoint_uri, connection_string: same as above.
  • entity_path is not applicable because container_name is already used
• iothub
  Endpoints can be specified directly on iothub, above properties are added here as well. Due to the limitation of schema in a TypeList, restrictions of these properties are put into code instead.
  Test result:
  

[YoshicoppensE61]

can this get merged for the 2.91 milestone?

[catriona-m]

Thanks @myc2h6o LGTM 🚀 !

[github-actions]

This functionality has been released in v2.93.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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