Add support for pyproject.toml.

[tobiasraabe]

Changes

• Add support for pyproject.toml as the configuration file.
• Raise warnings for ini formats and show a copy-paste snippet to migrate to the new configuration file.
• Remove all ini examples from the documentation.

[codecov]

Codecov Report

Merging #253 (7f65ea4) into main (8637853) will decrease coverage by 25.97%.
The diff coverage is 37.66%.

❗ Current head 7f65ea4 differs from pull request most recent head 3858d5a. Consider uploading reports for the commit 3858d5a to get more accurate results

@@             Coverage Diff             @@
##             main     #253       +/-   ##
===========================================
- Coverage   94.43%   68.46%   -25.98%     
===========================================
  Files          84       84               
  Lines        7094     7318      +224     
===========================================
- Hits         6699     5010     -1689     
- Misses        395     2308     +1913     

Flag	Coverage Δ
end_to_end	?
integration	?
unit	68.46% <37.66%> (-1.29%)	⬇️

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Impacted Files	Coverage Δ
src/_pytask/build.py	76.56% <0.00%> (-23.44%)	⬇️
src/_pytask/database.py	94.91% <ø> (-5.09%)	⬇️
src/_pytask/logging.py	93.20% <ø> (-1.03%)	⬇️
src/_pytask/parameters.py	100.00% <ø> (ø)
tests/test_collect_command.py	24.46% <7.40%> (-75.54%)	⬇️
tests/test_mark.py	45.45% <20.40%> (-53.76%)	⬇️
src/_pytask/mark/__init__.py	52.38% <25.00%> (-44.77%)	⬇️
tests/test_mark_cli.py	50.00% <27.77%> (-50.00%)	⬇️
tests/test_collect.py	65.64% <33.33%> (-28.62%)	⬇️
tests/test_profile.py	38.88% <33.33%> (-61.12%)	⬇️
... and 62 more

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