Added option to print per-label segmentation scores

[sarthakpati]

Fixes #246

Proposed Changes

• per-label segmentation scores (dice and hausdorff) 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

[codecov]

Codecov Report

Merging #264 (39f3dd8) into master (0840868) will increase coverage by 0.06%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##           master     #264      +/-   ##
==========================================
+ Coverage   87.33%   87.40%   +0.06%     
==========================================
  Files          80       80              
  Lines        4194     4240      +46     
==========================================
+ Hits         3663     3706      +43     
- Misses        531      534       +3     

Flag	Coverage Δ
unittests	87.40% <95.45%> (+0.06%)	⬆️

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

Impacted Files	Coverage Δ
GANDLF/compute/forward_pass.py	84.04% <88.23%> (-0.14%)	⬇️
GANDLF/compute/training_loop.py	81.48% <92.85%> (+0.50%)	⬆️
GANDLF/compute/loss_and_metric.py	96.66% <100.00%> (+0.51%)	⬆️
GANDLF/metrics/__init__.py	100.00% <100.00%> (ø)
GANDLF/metrics/segmentation.py	95.71% <100.00%> (+1.26%)	⬆️
testing/test_full.py	99.00% <100.00%> (ø)

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