feat: add API for data insights on PRs, issues, and code changes.

[xingwanying]

api ref: https://open-digger.cn/en/docs/user_docs/metrics/metrics_usage_guide

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
petercat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 20, 2025 8:17am

[petercat-assistant]

Walkthrough

This PR introduces a new API for data insights on pull requests, issues, and code changes. It adds new endpoints to the FastAPI router for fetching insights from GitHub repositories, utilizing external data sources to aggregate metrics by year, quarter, and month.

Changes

File	Summary
server/insight/router.py	Added new API endpoints for insights on issues, PRs, and code changes.
server/insight/service/issue.py, server/insight/service/pr.py	Implemented functions to fetch and process data for issues and PRs using a metrics mapping.
server/main.py	Integrated the new insight router into the main application.
server/tests/utils/test_insight.py	Added unit tests for the data fetching utility to ensure correct data aggregation.
server/utils/insight.py	Created a utility function to fetch and aggregate data from external sources.

[petercat-assistant]

The endpoint path for get_code_change_insight is missing a leading slash. It should be @router.get("/code_change") to ensure the route is correctly registered.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
server/main.py	92.30% <ø> (ø)

... and 2 files with indirect coverage changes

[ch-liuzhide]

LGTM