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

[aayush0325]

Resolves #3135 .

Description

What is the purpose of this pull request?

This pull request:

• adds at method to array/fixed-endian-factory
• adds the respective benchmarks and tests
• updates README

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: add at method to array/fixed-endian-factory #3135

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

the at method in @stdlib/array/bool had its benchmarks written in a single file so i followed that convention. kindly let me know if we need any changes.

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-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
array/fixed-endian-factory	$\color{red}705/964$ $\color{green}+73.13\%$	$\color{red}23/32$ $\color{green}+71.88\%$	$\color{red}8/20$ $\color{green}+40.00\%$	$\color{red}705/964$ $\color{green}+73.13\%$

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

[aayush0325]

kindly give this a review @kgryte !

[kgryte]

Thanks for working on this, @aayush0325. Two minor comments. Once resolved, this should be ready for merge.

[kgryte]

benchmarks written in a single file so i followed that convention.

Yes, for at that makes sense, as element access should not be length-dependent.

[aayush0325]

I've moved the stuff in main.js to where you requested and I've placed it alphabetically among the non static methods in README.md. I hope that's okay

[kgryte]

LGTM. Thanks, @aayush0325!