remove: remove stats/base/dmax

This commit removes `@stdlib/stats/base/dmax` in favor of
`@stdlib/stats/strided/dmax`.

BREAKING CHANGE: remove `stats/base/dmax`

To migrate, users should update their require/import paths to use
`@stdlib/stats/strided/dmax` which provides the same API and implementation.

Ref: stdlib-js#4797

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Author: kgryte