feat: New command pdm outdated

[frostming]

Close #358

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 86.91589% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 84.89%. Comparing base (bd92b07) to head (026a7fa).

Files	Patch %	Lines
src/pdm/cli/commands/outdated.py	83.72%	9 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2718      +/-   ##
==========================================
+ Coverage   84.87%   84.89%   +0.01%     
==========================================
  Files         104      105       +1     
  Lines       10332    10417      +85     
  Branches     2244     2272      +28     
==========================================
+ Hits         8769     8843      +74     
- Misses       1093     1101       +8     
- Partials      470      473       +3     

Flag	Coverage Δ
unittests	84.67% <86.91%> (+0.01%)	⬆️

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