Sets up pre-commit configuration, configures a pre-commit stage in GH Actions and applies the suggested linting.

The main changes are twofold:

• Whitespace
• Extra lines on file end

Great! Will you also add black? 😄

Codecov Report

Merging #5385 (4121527) into master (3424cd7) will increase coverage by 0.05%. The diff coverage is 36.36%.

@@            Coverage Diff             @@
##           master    #5385      +/-   ##
==========================================
+ Coverage   88.07%   88.12%   +0.05%     
==========================================
  Files         301      301              
  Lines       61969    62093     +124     
==========================================
+ Hits        54579    54722     +143     
+ Misses       7390     7371      -19     

Impacted Files	Coverage Δ
holoviews/core/io.py	80.30% <ø> (ø)
holoviews/element/geom.py	100.00% <ø> (ø)
holoviews/operation/datashader.py	83.98% <ø> (ø)
holoviews/operation/element.py	71.79% <ø> (+1.88%)	:arrow_up:
holoviews/operation/normalization.py	0.00% <ø> (ø)
holoviews/plotting/bokeh/path.py	91.42% <0.00%> (ø)
holoviews/plotting/mpl/plot.py	60.62% <0.00%> (ø)
holoviews/plotting/plotly/callbacks.py	94.90% <0.00%> (ø)
holoviews/pyodide.py	0.00% <0.00%> (ø)
holoviews/tests/core/data/test_ibisinterface.py	80.48% <ø> (ø)
... and 39 more

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