remove: remove stats/base/dmeanpw

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

BREAKING CHANGE: remove `stats/base/dmeanpw`

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

Ref: #4797

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Author: aayush0325