feat(pdm): handle PEP 621 dev groups

[mkniewallner]

Since PDM is based on PEP 621, we should probably also handle the new option added in #628.

This also fixes the logging by moving the logic to core, otherwise we would log dev depencencies twice for PDM (once in PEP621DependencyGetter and once in PDMDependencyGetter.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 90.7%. Comparing base (8b8b4e1) to head (437b043).
Report is 5 commits behind head on pep621-dev-deps.

Files	Patch %	Lines
python/deptry/core.py	85.7%	2 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           pep621-dev-deps    #637     +/-   ##
=================================================
+ Coverage             90.5%   90.7%   +0.2%     
=================================================
  Files                   33      33             
  Lines                  985     986      +1     
  Branches               194     198      +4     
=================================================
+ Hits                   892     895      +3     
+ Misses                  79      74      -5     
- Partials                14      17      +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.