feat: support implicit python script execution

[frostming]

Pull Request Check List

• 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.

Close #1626

[codecov-commenter]

Codecov Report

Base: 85.26% // Head: 85.26% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (6ab8fba) compared to base (4504f15).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1628      +/-   ##
==========================================
- Coverage   85.26%   85.26%   -0.01%     
==========================================
  Files          92       92              
  Lines        8492     8490       -2     
  Branches     1829     1831       +2     
==========================================
- Hits         7241     7239       -2     
  Misses        843      843              
  Partials      408      408              

Flag	Coverage Δ
unittests	85.08% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pdm/cli/commands/run.py	91.73% <100.00%> (+0.13%)	⬆️
src/pdm/cli/utils.py	80.96% <0.00%> (-0.22%)	⬇️
src/pdm/formats/poetry.py	85.91% <0.00%> (-0.20%)	⬇️

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