add unread_count and unread_count_batch prep

[JimmyPettersson85]

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Description of the pull request

• Adds support and tests for the server side unread counts endpoint
• Adds (prepatory) support and tests for the new batch unread counts endpoint
• Fixes a known issue with a dependency https://pytest-asyncio.readthedocs.io/en/latest/reference/changelog.html#known-issues
• Fixes deprecation warnings in old tests

[gumuz]

@JimmyPettersson85 I guess the tests fail because the backend feature has not been rolled out yet?

[JimmyPettersson85]

@JimmyPettersson85 I guess the tests fail because the backend feature has not been rolled out yet?

@gumuz correct, PR is pending for the endpoint in the chat repo

[gumuz]

🚀