feat: add the activity insight

[xingwanying]

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Name	Status	Preview	Comments	Updated (UTC)
petercat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 21, 2025 3:39am

[petercat-assistant]

Walkthrough

This pull request introduces a new feature to add activity insights into the application. It includes the implementation of a new API endpoint to fetch activity data for a given repository, processes the data to extract monthly insights, and adds corresponding unit tests to ensure functionality.

Changes

File	Summary
server/insight/router.py	Added a new API endpoint /activity to fetch activity insights.
server/insight/service/activity.py	Implemented get_activity_data function to retrieve and process activity data from an external source.
server/insight/service/issue.py, server/insight/service/pr.py	Removed unused imports.
server/tests/insight/test_activity.py	Added unit tests for get_activity_data to verify its functionality with various scenarios.

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