[MNT] Merge openml-sklearn back into OpenML keeping sklearn as a soft dep - #1605

[MNT] Merge openml-sklearn back into OpenML keeping sklearn as a soft dep#1605

jgyasu wants to merge 21 commits into

openml:mainopenml/openml-python:mainfrom

jgyasu:merge-sklearn-extensionjgyasu/openml-python:merge-sklearn-extensionCopy head branch name to clipboard