Added ability to specify testing data csv in main cli

[sarthakpati]

Fixes #544

Proposed Changes

• API for TrainingManager_split updated to include testing data
• new api is being used in main_run

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]

[github-actions]

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

[codecov]

Codecov Report

Merging #545 (30b1f04) into master (8aeed76) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #545   +/-   ##
=======================================
  Coverage   93.89%   93.90%           
=======================================
  Files         109      109           
  Lines        6943     6951    +8     
=======================================
+ Hits         6519     6527    +8     
  Misses        424      424           

Flag	Coverage Δ
unittests	93.90% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
GANDLF/training_manager.py	89.18% <ø> (ø)
GANDLF/cli/main_run.py	88.63% <100.00%> (+3.63%)	⬆️
testing/test_full.py	99.00% <100.00%> (+<0.01%)	⬆️
...NDLF/data/preprocessing/template_matching/utils.py	95.34% <0.00%> (-2.33%)	⬇️

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[AlexanderGetka-cbica]

LGTM!