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

[adityacodes30]

Resolves #3146

Description

What is the purpose of this pull request?

This pull request:

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

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: add indexOf method to array/fixed-endian-factory #3146

Questions

Any questions for reviewers of this pull request?

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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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
array/fixed-endian-factory	$\color{red}890/1147$ $\color{green}+77.59\%$	$\color{red}75/84$ $\color{green}+89.29\%$	$\color{red}15/26$ $\color{green}+57.69\%$	$\color{red}890/1147$ $\color{green}+77.59\%$

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

[kgryte]

LGTM. Thanks, @adityacodes30!