Types of changes

This is a long needed implementation of the Entropic OT mapping from

[66] Pooladian, Aram-Alexandre, and Jonathan Niles-Weed. Entropic estimation of optimal transport maps. arXiv preprint arXiv:2109.12004 (2021).

[19] Seguy, V., Bhushan Damodaran, B., Flamary, R., Courty, N., Rolet, A.& Blondel, M. Large-scale Optimal Transport and Mapping Estimation. International Conference on Learning Representation (2018)

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.