DEP: deprecate spatial.distance.kulsinski

[j-bowhay]

Reference issue

Closes #15125
Supersedes #15180

What does this implement/fix?

Finished off the pr started by @deepakdinesh1123 to deprecate spatial.distance.kulsinski.

Additional information

@tupui is this the correct way to give attribution to the work originally done by @deepakdinesh1123 ?

[tupui]

Thank you @j-bowhay for the quick work. I will wait for the CI but at first glance it looks good. (seeing a failure but unrelated and might be due to the fact that you merged an old remote instead of upstream main. So Azure does not have latest.)

@tupui is this the correct way to give attribution to the work originally done by @deepakdinesh1123

Yes it's perfect since you preserved the original commits, thank you.

[tupui]

I missed this from the CI. We had other intermittent bug there and wrongly assumed it was the same.

======================
scipy.spatial.distance
======================

Non-deprecated objects in __all__: 29
Objects in refguide: 30

ERROR: missing objects::

    kulsinski