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

[gururaj1512]

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type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes. report:

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Resolves #5691 .

Description

What is the purpose of this pull request?

This pull request:

• Adds accessor arrays support.
• Refactors stats/base/variancewd.

Related Issues

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This pull request:

• None

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No.

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Checklist

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• Read, understood, and followed the contributing guidelines

@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/variancewd	$\color{green}388/388$ $\color{green}+100.00\%$	$\color{green}17/17$ $\color{green}+100.00\%$	$\color{green}3/3$ $\color{green}+100.00\%$	$\color{green}388/388$ $\color{green}+100.00\%$

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

[kgryte]

LGTM