Post-processing module added

[sarthakpati]

Fixes #288

Proposed Changes

• post-processing module added
• fill holes implementation simplified
• morphological operations using torch have been added
• tests updated

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

[codecov]

Codecov Report

Merging #289 (204ff65) into master (cf2a583) will increase coverage by 0.27%.
The diff coverage is 96.87%.

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
+ Coverage   87.45%   87.73%   +0.27%     
==========================================
  Files          80       81       +1     
  Lines        4218     4240      +22     
==========================================
+ Hits         3689     3720      +31     
+ Misses        529      520       -9     

Flag	Coverage Δ
unittests	87.73% <96.87%> (+0.27%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
GANDLF/post_process/morphology.py	95.83% <95.83%> (ø)
GANDLF/post_process/__init__.py	100.00% <100.00%> (ø)
testing/test_full.py	99.01% <100.00%> (+0.01%)	⬆️

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