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

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.