[DA] Sinkhorn LpL1 transport to work on JAX

[kachayev]

Types of changes

This PR presents a vectorized implementation of LpL1 transport algorithms for domain adaptation, along with all the requisite modifications to ensure compatibility of the ot.da module with JAX.

Motivation and context / Related issue

Continuing the effort to enable Domain Adaptation functionality in JAX. See also previously introduced changes in PR #587 for details.

How has this been tested (if it applies)

The tests have been updated. Additionally, a dedicated test has been included to verify that the vectorized implementation produces the same results as the original code.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 96.66%. Comparing base (a8f0ed5) to head (ca00540).

Additional details and impacted files

@@ Coverage Diff @@## master #592 +/- ##
=======================================
Coverage 96.66% 96.66% =======================================
Files 85 85 Lines 16898 16928 +30 =======================================
+ Hits 16334 16364 +30 
Misses 564 564 

[cedricvincentcuaz]

Thank you for this PR @kachayev,
sorry for the late review on this PR. I put some remarks to ensure compatibility with all backends. Could you take them into account and mention the fix in the RELEASE.md file ?

Best,
Cédric