feat: option to ship pip when creating a venv

[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.

[codecov-commenter]

Codecov Report

Base: 84.90% // Head: 84.95% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (ea882e4) compared to base (39d6c04).
Patch coverage: 94.44% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1463      +/-   ##
==========================================
+ Coverage   84.90%   84.95%   +0.05%     
==========================================
  Files          88       88              
  Lines        7643     7658      +15     
  Branches     1792     1796       +4     
==========================================
+ Hits         6489     6506      +17     
  Misses        768      768              
+ Partials      386      384       -2     

Flag	Coverage Δ
unittests	84.77% <94.44%> (+0.05%)	⬆️

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

Impacted Files	Coverage Δ
src/pdm/project/config.py	89.72% <ø> (ø)
src/pdm/cli/commands/venv/backends.py	91.08% <94.11%> (+0.28%)	⬆️
src/pdm/cli/commands/venv/create.py	100.00% <100.00%> (ø)
src/pdm/termui.py	90.57% <0.00%> (+0.72%)	⬆️
src/pdm/models/repositories.py	78.86% <0.00%> (+0.81%)	⬆️

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