[MRG] add debiasing and all new solvers to ot.solve_sample

[rflamary]

Types of changes

All the following fetaure have been added+tested in ot.solve_sample:

• Add debiasing with (both sinkhorn/OT divergence with debias=True and minibtach with data splitting debias='split' )
• Add sliced and and max sliced solvers (with method='sliced'and method='max_sliced')
• Add wrapper for BSP OT solver with method='bsp')
• Add solver for HD gaussian
• Reoganized and better test for acepted methods in ot.solve and ot.solve_sample
• Update documentation for solve_sample and the quickstart guide too.

Motivation and context / Related issue

How has this been tested (if it applies)

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 99.19028% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.85%. Comparing base (956240b) to head (6d82205).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #831      +/-   ##
==========================================
+ Coverage   96.83%   96.85%   +0.01%     
==========================================
  Files         128      128              
  Lines       25376    25593     +217     
==========================================
+ Hits        24574    24788     +214     
- Misses        802      805       +3     

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