chore: use ruff for linting; add precommit conf

[ab93]

• Introduces ruff for linting
• Add precommit config for autofix before commiting
• Improve readme
• Update github actions to be faster
• Move tests out of package

[codecov[bot]]

Codecov Report

Merging #94 (b752cd4) into main (97d7f4e) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
+ Coverage   97.20%   97.22%   +0.01%     
==========================================
  Files          16       16              
  Lines         716      721       +5     
  Branches       45       45              
==========================================
+ Hits          696      701       +5     
  Misses         10       10              
  Partials       10       10              

Impacted Files	Coverage Δ
pynumaflow/function/_dtypes.py	98.84% <100.00%> (ø)
pynumaflow/function/async_server.py	97.67% <100.00%> (+0.01%)	:arrow_up:
pynumaflow/function/multiproc_server.py	97.40% <100.00%> (+0.03%)	:arrow_up:
pynumaflow/function/server.py	97.26% <100.00%> (+0.03%)	:arrow_up:
pynumaflow/sink/_dtypes.py	98.33% <100.00%> (ø)
pynumaflow/sink/async_sink.py	94.23% <100.00%> (+0.11%)	:arrow_up:
pynumaflow/sink/server.py	95.91% <100.00%> (+0.08%)	:arrow_up:

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