docs(sessions): add POST /api/sessions/{sessionId}/chats/{chatId}/messages endpoint for persisting assistant messages

[pradipthaadhi]

• Introduced a new POST endpoint to allow the upsertion of assistant chat messages into specified chats within a session.
• Detailed request and response schemas added, including validation rules for message structure and error handling.
• Updated navigation to include the new endpoint in the sessions documentation, enhancing the API's capabilities for chat management.

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📥 Commits

Reviewing files that changed from the base of the PR and between dee6c1a and 1f26009.

📒 Files selected for processing (3)

• api-reference/openapi/sessions.json
• api-reference/sessions/post-chat-message.mdx
• docs.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/openapi-session-chat-post-messages

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