chat: add Jetpack Compose support to documentation

[ttypic]

Description

• Added examples showcasing the use of Jetpack Compose APIs in the chat SDK.
• Updated documentation to include Jetpack Compose methods such as collectAsPagingMessagesState(), collectAsCurrentlyTyping(), collectAsStatus(), and others.
• Extended sections with Jetpack Compose-specific code snippets for message reactions, typing events, room management, and more.

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chat-jetpack-compose

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