Add naive community merge using time period

[AlonsoGuevara]

Description

Use time periods to merge communities and community reports, without altering original communities.

Related Issues

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Proposed Changes

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Checklist

• [ ] I have tested these changes locally.
• [ ] I have reviewed the code changes.
• [ ] I have updated the documentation (if necessary).
• [ ] I have added appropriate unit tests (if applicable).

Additional Notes

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