Adding automated linting check for black

[sarthakpati]

Fixes #285

Proposed Changes

• automated code linting added

Checklist

• I have read the CONTRIBUTING guide
• My PR is based from the current GaNDLF master
• Non-breaking change (would not break existing functionality): please provide as many details as possible for any breaking change
• Function/class source code documentation added/updated
• Code has been blacked for style consistency
• If applicable, version information has been updated in GANDLF/version.py
• If adding a submodule, add to list of exceptions for black styling in pyproject.toml file
• Usage documentation has been updated, if appropriate
• History has been updated, if appropriate
• Tests added or modified to cover the changes; if coverage is reduced, please give explanation

[sarthakpati]

Once this gets merged, the Lint/black check will become a required check to pass.

[codecov]

Codecov Report

Merging #284 (c2ff0ef) into master (db83c55) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #284   +/-   ##
=======================================
  Coverage   87.45%   87.45%           
=======================================
  Files          80       80           
  Lines        4218     4218           
=======================================
  Hits         3689     3689           
  Misses        529      529           

Flag	Coverage Δ
unittests	87.45% <ø> (ø)

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