Added ability to call specific post processing algorithms after reverse one-hot encoding

[sarthakpati]

Fixes #493

Proposed Changes

• new key added for params that controls when the post-processing algorithm is applied
• ensuring post processing is applied in 2 different ways during the forward pass
• updated default model output for segmentation
• added a helper function for tests to get temp config file path
• added docs

Checklist

• I have read the CONTRIBUTING guide
• My PR is based from the current GaNDLF master
• Non-breaking change (does not break existing functionality): 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 git 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
• If customized dependency installation is required (i.e., a separate pip install step is needed for PR to be functional), please ensure it is reflected in all the files that control the CI, namely: python-test.yml, and all docker files [1,2,3,4]

[codecov]

Codecov Report

Merging #494 (08cca1a) into master (be60609) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #494      +/-   ##
==========================================
+ Coverage   93.18%   93.30%   +0.11%     
==========================================
  Files         104      104              
  Lines        6458     6468      +10     
==========================================
+ Hits         6018     6035      +17     
+ Misses        440      433       -7     

Flag	Coverage Δ
unittests	93.30% <100.00%> (+0.11%)	⬆️

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

Impacted Files	Coverage Δ
GANDLF/compute/forward_pass.py	93.39% <100.00%> (+1.28%)	⬆️
GANDLF/data/post_process/__init__.py	100.00% <100.00%> (ø)
GANDLF/data/post_process/tensor.py	100.00% <100.00%> (ø)
GANDLF/parseConfig.py	77.32% <100.00%> (+0.57%)	⬆️
GANDLF/utils/tensor.py	88.27% <100.00%> (ø)
testing/test_full.py	98.97% <100.00%> (+0.31%)	⬆️

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