[RFC]: add `blas/ext/base/dmskrev`

[kgryte]

Signature:

dmskrev( N, x, strideX, mask, strideMask )
dmskrev.ndarray( N, x, strideX, offsetX, mask, strideMask, offsetMask )

For a reference: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/dmskmax

Time estimate without AI: 3-4hrs
Time estimate with AI: 2-3hrs

[headlessNode]

@naterush Could you please assign this issue a label? I'm planning to work on this issue during the weekend, thanks!