feat: add copyWithin method to array/fixed-endian-factory

[adityacodes30]

Resolves #3136

Description

What is the purpose of this pull request?

This pull request:

• adds support for a copyWithin method to @stdlib/array/fixed-endian-factory.

Related Issues

Does this pull request have any related issues?

#3136

This pull request:

• resolves [RFC]: add copyWithin method to array/fixed-endian-factory #3136

Questions

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No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

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Coverage Report

Package	Statements	Branches	Functions	Lines
array/fixed-endian-factory	$\color{red}855/1114$ $\color{green}+76.75\%$	$\color{red}73/87$ $\color{green}+83.91\%$	$\color{red}13/23$ $\color{green}+56.52\%$	$\color{red}855/1114$ $\color{green}+76.75\%$

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