feat: add joinOrLeave community endpoint

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What does this PR do?

🤖 Generated by Copilot at d6848c6

Renamed and refactored the joinCommunity handler and endpoint to joinOrLeaveCommunity and /joinOrLeave in the communities worker package. This allows users to join or leave a community with a single request and simplifies the API.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at d6848c6

• Simplify the API for joining and leaving communities by using a single handler and endpoint (link, link, link)
• Rename the joinCommunity handler to joinOrLeaveCommunity and modify it to check the user's membership status and perform the appropriate database operation (link)
• Rename the joinCommunity module to joinOrLeaveCommunity and update the import statement in index.ts (link)
• Rename the /join endpoint to /joinOrLeave and update the router in index.ts (link)

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