Add image similarity metrics

[sarthakpati]

Fixes #668

Proposed Changes

• added metrics for image similarity metrics
• because the torchmetrics version needed to be updated, some API changes needed to happen

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].

[github-actions]

MLCommons CLA bot All contributors have signed the MLCommons CLA ✍️ ✅

[codecov]

Codecov Report

Merging #669 (0e155e5) into master (23b5005) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #669      +/-   ##
==========================================
+ Coverage   94.42%   94.52%   +0.10%     
==========================================
  Files         115      116       +1     
  Lines        7879     8006     +127     
==========================================
+ Hits         7440     7568     +128     
+ Misses        439      438       -1     

Flag	Coverage Δ
unittests	94.52% <100.00%> (+0.10%)	⬆️

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

Impacted Files	Coverage Δ
GANDLF/metrics/classification.py	100.00% <ø> (ø)
GANDLF/metrics/regression.py	92.68% <ø> (ø)
GANDLF/utils/__init__.py	100.00% <ø> (ø)
GANDLF/cli/generate_metrics.py	100.00% <100.00%> (ø)
GANDLF/metrics/__init__.py	100.00% <100.00%> (ø)
GANDLF/metrics/generic.py	95.00% <100.00%> (ø)
GANDLF/metrics/synthesis.py	100.00% <100.00%> (ø)
GANDLF/utils/tensor.py	87.04% <100.00%> (+0.78%)	⬆️
testing/test_full.py	99.15% <100.00%> (+<0.01%)	⬆️

... and 1 file with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more