Add Baumgartner Weiss Schindler test

Hi,

This is my first post here.

I've created a bws test function that is missing from the current scipy
package.

The Baumgartner-Weiss-Schindler (BWS) test is a nonparametric test of the
null hypothesis that the distribution underlying sample x is the same as
the distribution underlying sample y. Unlike the Kolmogorv-Smirnov,
Wilcoxon, and Cramer-Von Mises tests, the Baumgartner-Weiss-Schindler test
weights the integral by the variance of the difference in CDFs, emphasizing
the tails of the distributions, which increases the power of the test for a
lot of applications.

My current pull request is found here:
https://github.com/scipy/scipy/pull/18317


Thanks so much for any feedback.

Cheers, Jimmy

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