Implement missing Integration Manager API actions

[justinbot]

Your use case

What would you like to do?

Add support for these missing Integration Manager postmessage API actions in order to have parity with matrix-react-sdk:

• get_open_id_token
  • Description
  • Reference implementation
• kick
  • Description
  • Reference implementation
• send_event
  • Description
  • Reference implementation
• read_events
  • Description
  • Reference implementation
• get_room_enc_state

Why would you like to do it?

In order to support new integration manager functionality.

How would you like to achieve it?

Add these actions to the existing Integration Manager postmessage API implementation:
https://github.com/vector-im/element-android/blob/8238cd7f57de936677e72798badef99135116a59/vector/src/main/java/im/vector/app/features/widgets/WidgetPostAPIHandler.kt#L45-L49

Have you considered any alternatives?

No response

Additional context

No response

Are you willing to provide a PR?

No

[ganfra]

As we are going to move to ElementX, maybe it could be integrated to the matrix-rust-sdk at some point instead?

[justinbot]

For Element X integration managers should use the Widget API instead: element-hq/element-meta#792

The idea here is that in the meantime, we could maintain integration manager support with these relatively minor additions to the old Integration Manager postmessage API