Replace ColorCode with custom rich themes.

[tobiasraabe]

Internal refactoring from ColorCode enum to custom rich themes.

[codecov]

Codecov Report

Merging #173 (db68c79) into main (0b60e2a) will decrease coverage by 0.02%.
The diff coverage is 86.84%.

@@            Coverage Diff             @@
##             main     #173      +/-   ##
==========================================
- Coverage   92.80%   92.78%   -0.03%     
==========================================
  Files          70       70              
  Lines        6405     6399       -6     
==========================================
- Hits         5944     5937       -7     
- Misses        461      462       +1     

Flag	Coverage Δ
end_to_end	79.76% <86.84%> (-0.04%)	⬇️
integration	41.94% <13.15%> (-0.15%)	⬇️
unit	67.71% <55.26%> (-0.05%)	⬇️

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Impacted Files	Coverage Δ
src/_pytask/enums.py	100.00% <ø> (ø)
src/_pytask/hookspecs.py	97.00% <ø> (ø)
src/_pytask/live.py	99.36% <ø> (ø)
tests/test_live.py	100.00% <ø> (ø)
src/_pytask/clean.py	90.90% <50.00%> (-0.07%)	⬇️
src/_pytask/collect_command.py	87.93% <50.00%> (-0.11%)	⬇️
src/_pytask/graph.py	75.49% <50.00%> (-0.17%)	⬇️
src/_pytask/profile.py	86.95% <50.00%> (-0.08%)	⬇️
src/_pytask/console.py	94.91% <88.88%> (-1.24%)	⬇️
src/_pytask/collect.py	94.02% <100.00%> (ø)
... and 6 more

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