Proposal to self-merge gh-24490 and gh-24506

gh-24490 (opened 2/1) and gh-24506 (opened 2/3) add MArray support to several scipy.stats functions. There is more MArray-related work to be done, so to avoid building on the stack of unmerged code, I propose to re-review and self-merge the PRs on 3/1 and 3/3, respectively. The risk seems low, as the adjustments are fairly routine, tests are only added (not removed or changed), and the use of MArrays is still behind the SCIPY_ARRAY_API environment variable. Reviews in the meantime welcome!

Matt