[WIP] Spectral-Grassmann OT

[thibaut-germain]

Types of changes

Adding sgot file in the ot folder.

Motivation and context / Related issue

Keep track of SGOT implementation in POT.

How has this been tested (if it applies)

Not tested yet.

PR checklist

• I have read the CONTRIBUTING document.
• The documentation is up-to-date with the changes I made (check build artifacts).
• [] All tests passed, and additional code has been covered with new tests.
• I have added the PR and Issue fix to the RELEASES.md file.

[codecov]

Codecov Report

❌ Patch coverage is 10.36036% with 199 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.92%. Comparing base (e164e78) to head (1c73452).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #792      +/-   ##
==========================================
- Coverage   96.77%   95.92%   -0.86%     
==========================================
  Files         107      108       +1     
  Lines       22342    22564     +222     
==========================================
+ Hits        21622    21645      +23     
- Misses        720      919     +199     

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