[WIP] BSP-OT: Sparse transport plans between discrete measures in loglinear time

[dcoeurjo]

Initial fork and PR. (wip)

Types of changes

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.15%. Comparing base (5a7d086) to head (1ae8472).

Additional details and impacted files

@@ Coverage Diff @@ ## master #768 +/- ## ======================================= Coverage 97.15% 97.15% ======================================= Files 107 107 Lines 21877 21877 ======================================= Hits 21254 21254 Misses 623 623 

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