Add schedulers monai

[Ainesh06102004]

Fixes #805

Proposed Changes

• added WarmupCosineSchedule

Checklist

• CONTRIBUTING guide has been followed.
• PR is based on 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 (ensure typing is used to provide type hints, including and not limited to using Optional if a variable has a pre-defined value).
• Code has been blacked for style consistency and linting.
• 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.
• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 95.02%. Comparing base (64962a1) to head (b2482ea).

❗ Current head b2482ea differs from pull request most recent head 3ca6792. Consider uploading reports for the commit 3ca6792 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #807      +/-   ##
==========================================
- Coverage   95.05%   95.02%   -0.03%     
==========================================
  Files         119      120       +1     
  Lines        8288     8267      -21     
==========================================
- Hits         7878     7856      -22     
- Misses        410      411       +1     

Flag	Coverage Δ
unittests	95.02% <100.00%> (-0.03%)	⬇️

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[sarthakpati]

Requesting minor changes.

[sarthakpati]

LGTM