feat: introduce ruff for linter

[zhongjiajie]

and remove flake8, isort, and autoflake

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (b6b067b) 95.60% compared to head (ac97633) 94.68%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
- Coverage   95.60%   94.68%   -0.93%     
==========================================
  Files           7        7              
  Lines         182      188       +6     
==========================================
+ Hits          174      178       +4     
- Misses          8       10       +2     

Flag	Coverage Δ
unittests	94.68% <77.77%> (-0.93%)	⬇️

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Files	Coverage Δ
src/stmdency/models/node.py	76.92% <100.00%> (ø)
src/stmdency/visitors/assign.py	96.66% <75.00%> (-3.34%)	⬇️
src/stmdency/visitors/function_def.py	93.93% <75.00%> (-1.30%)	⬇️

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