Implemented matching by expressions and marker expressions.

[tobiasraabe]

Changes

pytest has two mechanisms to select tests which are expressions passed to -k or marker expressions passed to -m. This PR implements the same behavior.

Additionally, the PR restructured some parts of pytask and hopefully makes circular imports less likely.

[codecov]

Codecov Report

Merging #13 into main will decrease coverage by 5.48%.
The diff coverage is 89.67%.

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
- Coverage   89.11%   83.63%   -5.49%     
==========================================
  Files          36       37       +1     
  Lines        1782     1949     +167     
==========================================
+ Hits         1588     1630      +42     
- Misses        194      319     +125     

Flag	Coverage Δ
#end_to_end	?
#integration	?
#unit	83.63% <89.67%> (+9.27%)	⬆️

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

Impacted Files	Coverage Δ
tests/test_parametrize.py	39.13% <40.00%> (-56.22%)	⬇️
src/pytask/mark_/structures.py	90.10% <75.00%> (ø)
tests/test_mark.py	80.45% <78.43%> (-17.05%)	⬇️
src/pytask/mark_/__init__.py	80.95% <80.95%> (ø)
src/pytask/cli.py	94.64% <96.77%> (+5.75%)	⬆️
src/pytask/mark_/expression.py	98.34% <98.34%> (ø)
src/pytask/__init__.py	100.00% <100.00%> (ø)
src/pytask/collect.py	88.18% <100.00%> (-3.41%)	⬇️
src/pytask/config.py	91.93% <100.00%> (-8.07%)	⬇️
src/pytask/execute.py	87.61% <100.00%> (-8.85%)	⬇️
... and 31 more

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