feat: Experimental uv integration

[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]

Codecov Report

Attention: Patch coverage is 77.68187% with 181 lines in your changes missing coverage. Please review.

Project coverage is 85.63%. Comparing base (4d880cc) to head (b4cbed8).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pdm/resolver/uv.py	66.66%	26 Missing and 24 partials ⚠️
src/pdm/formats/uv.py	75.59%	24 Missing and 17 partials ⚠️
src/pdm/installers/base.py	75.00%	28 Missing and 7 partials ⚠️
src/pdm/installers/uv.py	60.65%	14 Missing and 10 partials ⚠️
src/pdm/core.py	65.00%	5 Missing and 2 partials ⚠️
src/pdm/resolver/base.py	85.10%	6 Missing and 1 partial ⚠️
src/pdm/resolver/resolvelib.py	93.47%	2 Missing and 4 partials ⚠️
src/pdm/installers/synchronizers.py	69.23%	3 Missing and 1 partial ⚠️
src/pdm/cli/commands/self_cmd.py	33.33%	2 Missing ⚠️
src/pdm/cli/commands/venv/backends.py	77.77%	1 Missing and 1 partial ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3144      +/-   ##
==========================================
- Coverage   86.20%   85.63%   -0.58%     
==========================================
  Files         107      112       +5     
  Lines       10715    11213     +498     
  Branches     2292     2432     +140     
==========================================
+ Hits         9237     9602     +365     
- Misses       1015     1098      +83     
- Partials      463      513      +50     

Flag	Coverage Δ
unittests	85.43% <77.68%> (-0.57%)	⬇️

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