feat: add support for accessor arrays and refactor stats/base/mskrange

[vivekmaurya001]

Resolves #{{TODO: add issue number}}.

This pull request:

• add accessor arrays support and refactor stats/base/mskrange

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves #{{TODO: add issue number}}

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No.

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Checklist

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• Read, understood, and followed the contributing guidelines

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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/mskrange	$\color{green}366/366$ $\color{green}+100.00\%$	$\color{green}46/46$ $\color{green}+100.00\%$	$\color{green}3/3$ $\color{green}+100.00\%$	$\color{green}366/366$ $\color{green}+100.00\%$

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

[kgryte]

LGTM