CLI --print-config option

[forman]

Added CLI --print-config option.

Checklist (strike out non-applicable):

• Changes documented in CHANGES.md
• Related issue exists and is referred to in the PR description and CHANGES.md
• Added docstrings and API docs for any new/modified user-facing classes and functions
• Changes/features documented in docs/*
• Unit-tests adapted/added for changes/features
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

Attention: Patch coverage is 94.94949% with 5 lines in your changes missing coverage. Please review.

Project coverage is 96.11%. Comparing base (8845c39) to head (1256cbf).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
xrlint/cli/engine.py	94.11%	1 Missing and 1 partial ⚠️
xrlint/cli/main.py	90.47%	1 Missing and 1 partial ⚠️
xrlint/config.py	93.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
- Coverage   96.14%   96.11%   -0.03%     
==========================================
  Files          52       51       -1     
  Lines        1765     1804      +39     
  Branches      236      240       +4     
==========================================
+ Hits         1697     1734      +37     
- Misses         34       35       +1     
- Partials       34       35       +1     

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