Invoke pytask through the Python interpreter.

[tobiasraabe]

This PR allows to use pytask via python -m pytask which will also add the current path to sys.path.

[codecov]

Codecov Report

Merging #51 (26e1e8b) into main (21ba23a) will increase coverage by 0.00%.
The diff coverage is 93.75%.

@@           Coverage Diff           @@
##             main      #51   +/-   ##
=======================================
  Coverage   89.47%   89.47%           
=======================================
  Files          54       55    +1     
  Lines        4457     4467   +10     
=======================================
+ Hits         3988     3997    +9     
- Misses        469      470    +1     

Flag	Coverage Δ
end_to_end	74.99% <81.25%> (+0.03%)	⬆️
integration	41.68% <43.75%> (+0.04%)	⬆️
unit	68.97% <75.00%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
src/pytask/__main__.py	75.00% <75.00%> (ø)
src/_pytask/capture.py	84.57% <100.00%> (ø)
src/_pytask/logging.py	92.85% <100.00%> (ø)
src/_pytask/mark/expression.py	98.34% <100.00%> (ø)
src/_pytask/mark/structures.py	92.30% <100.00%> (ø)
tests/test_execute.py	100.00% <100.00%> (ø)

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