feat: support copier and cookiecutter as project generator

[frostming]

Signed-off-by: Frost Ming me@frostming.com

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: 61.01% and project coverage change: -0.18 ⚠️

Comparison is base (5149924) 84.75% compared to head (7c0d4f9) 84.58%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2059      +/-   ##
==========================================
- Coverage   84.75%   84.58%   -0.18%     
==========================================
  Files         100      100              
  Lines        9558     9600      +42     
  Branches     2087     2098      +11     
==========================================
+ Hits         8101     8120      +19     
- Misses       1004     1026      +22     
- Partials      453      454       +1     

Flag	Coverage Δ
unittests	84.36% <59.32%> (-0.19%)	⬇️

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Impacted Files	Coverage Δ
src/pdm/cli/commands/init.py	79.38% <51.11%> (-15.51%)	⬇️
src/pdm/utils.py	84.31% <85.71%> (+0.03%)	⬆️
src/pdm/models/session.py	88.88% <100.00%> (+0.88%)	⬆️
src/pdm/pytest.py	92.30% <100.00%> (-0.05%)	⬇️

... and 1 file with indirect coverage changes

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