Enabling inference without having access to the ground truth

[sarthakpati]

Fixes #360

Proposed Changes

• added logic to not require ground truth during inference

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 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 #363 (cd0e82b) into master (25f05dd) will increase coverage by 0.30%.
The diff coverage is 96.80%.

@@            Coverage Diff             @@
##           master     #363      +/-   ##
==========================================
+ Coverage   90.92%   91.23%   +0.30%     
==========================================
  Files          89       89              
  Lines        5016     5052      +36     
==========================================
+ Hits         4561     4609      +48     
+ Misses        455      443      -12     

Flag	Coverage Δ
unittests	91.23% <96.80%> (+0.30%)	⬆️

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

Impacted Files	Coverage Δ
GANDLF/utils/__init__.py	100.00% <ø> (ø)
GANDLF/compute/forward_pass.py	89.40% <94.33%> (+4.85%)	⬆️
GANDLF/compute/step.py	78.26% <100.00%> (+2.07%)	⬆️
GANDLF/inference_manager.py	98.03% <100.00%> (+4.28%)	⬆️
GANDLF/utils/generic.py	83.72% <100.00%> (+1.22%)	⬆️
testing/test_full.py	98.42% <100.00%> (+0.03%)	⬆️
GANDLF/metrics/segmentation.py	95.71% <0.00%> (-1.43%)	⬇️
GANDLF/data/ImagesFromDataFrame.py	89.36% <0.00%> (+1.41%)	⬆️

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