feat: add an --overwrite option to pdm init

[frostming]

Fixes #2163

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-commenter]

Codecov Report

Patch coverage: 80.00% and project coverage change: -0.01% ⚠️

Comparison is base (eae7cbf) 84.30% compared to head (1ba7eb6) 84.29%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2166      +/-   ##
==========================================
- Coverage   84.30%   84.29%   -0.01%     
==========================================
  Files         100      100              
  Lines        9779     9781       +2     
  Branches     2159     2160       +1     
==========================================
+ Hits         8244     8245       +1     
  Misses       1062     1062              
- Partials      473      474       +1     

Flag	Coverage Δ
unittests	84.07% <80.00%> (-0.01%)	⬇️

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Files Changed	Coverage Δ
src/pdm/cli/templates/__init__.py	84.55% <66.66%> (-0.70%)	⬇️
src/pdm/cli/commands/init.py	79.54% <100.00%> (+0.15%)	⬆️

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