feat: initialize git repository when running pdm init

[frostming]

Signed-off-by: Frost Ming [email protected]

Pull Request Checklist

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 85.40%. Comparing base (b6355f1) to head (c14791c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pdm/cli/commands/init.py	50.00%	6 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3483      +/-   ##
==========================================
- Coverage   85.46%   85.40%   -0.06%     
==========================================
  Files         114      114              
  Lines       11708    11726      +18     
  Branches     2578     2581       +3     
==========================================
+ Hits        10006    10015       +9     
- Misses       1160     1166       +6     
- Partials      542      545       +3     

Flag	Coverage Δ
unittests	85.21% <50.00%> (-0.06%)	⬇️

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