feat: Add lock option to resolve direct dependencies to the minimal versions available

[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.

Resolve #2310

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
src/pdm/cli/actions.py	79.00% <100.00%> (-0.23%)	⬇️
src/pdm/cli/commands/lock.py	100.00% <100.00%> (ø)
src/pdm/cli/options.py	94.91% <100.00%> (+0.22%)	⬆️
src/pdm/cli/utils.py	81.94% <100.00%> (+0.12%)	⬆️
src/pdm/environments/base.py	73.20% <100.00%> (ø)
src/pdm/models/repositories.py	74.02% <100.00%> (+0.07%)	⬆️
src/pdm/project/core.py	89.32% <100.00%> (ø)
src/pdm/pytest.py	92.38% <100.00%> (ø)
src/pdm/resolver/providers.py	92.94% <100.00%> (+0.25%)	⬆️
src/pdm/models/finder.py	88.46% <88.46%> (ø)
... and 1 more

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