added linting ci action, fixes #84

[bmcfee]

This PR adds a CI action for bandit, codespell, velin, pycodestyle, and flake8.

[codecov-commenter]

Codecov Report

Merging #87 (b8de573) into main (992f4a8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #87   +/-   ##
=======================================
  Coverage   84.46%   84.46%           
=======================================
  Files           4        4           
  Lines         103      103           
=======================================
  Hits           87       87           
  Misses         16       16           

Flag	Coverage Δ
unittests	84.46% <100.00%> (ø)

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Impacted Files	Coverage Δ
resampy/filters.py	79.48% <ø> (ø)
resampy/core.py	85.96% <100.00%> (ø)

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