feat: add stats/base/ndarray/dmeanstdev

[Orthodox-64]

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Resolves None.

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This pull request:

• feat: add stats/base/ndarray/dmeanstdev

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/ndarray/dmeanstdev	$\color{green}126/126$ $color{green}+100.00%$	$\color{green}3/3$ $color{green}+100.00%$	$\color{green}1/1$ $color{green}+100.00%$	$\color{green}126/126$ $color{green}+100.00%$

The above coverage report was generated for the changes in this PR.

[kgryte]

You should just copy the introduction from stats/strided/dmeanstdev instead of rolling your own. This makes find-and-replace easier when we are consistent in our docs across similar packages.

[kgryte]

This is not what is desired. For a much more complicated API, see https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/ndarray/dztest. Notice there that scalar parameters, such as should be done for correction, are provided as ancillary arrays. Hardcoding 1 for the correction is not what we want.

[kgryte]

Left some initial comments.

[Orthodox-64]

@kgryte Done — I’ve applied all the requested changes.