[RFC]: add `at` method to `array/fixed-endian-factory`

[kgryte]

Description

This RFC proposes adding support for an at method to @stdlib/array/fixed-endian-factory.

This method is the equivalent of the TypedArray.prototype.at method, but for fixed-endian typed arrays.

When adding support, the following tasks should be completed:

1. The ./lib/main.js file should be updated with the added method.
2. A new test file should be created which includes unit tests testing against expected behavior.
3. Two benchmark files should be added: one measuring baseline performance and another measuring performance as the array length increases.
4. The README should be updated to include documentation for the added method.

To provide a concrete example of what a PR adding the desired method should contain, see 956a462, which is a commit adding forEach support. This should provide an idea of what is expected.

For an example of specialized typed arrays having customized methods, see

• @stdlib/array/bool
• @stdlib/array/complex128
• @stdlib/array/complex64

While the method proposed in this RFC will likely not match the implementations found in the above packages, those packages should provide a conceptual idea of what is desired. Do not simply copy-paste the code found in those packages.

Notes

• If you are interested in contributing a PR which addresses this RFC and are a first-time contributor or not yet familiar with our project conventions, please do not submit LLM-generated code. Please consult our contributing guidelines and the associated development guide. Failure to respect project conventions will result in your PR being rejected without review. Thank you for understanding!

Checklist

• I have read and understood the Code of Conduct.
• Searched for existing issues and pull requests.
• The issue name begins with [RFC]:.

[stdlib-bot]

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✨ Thank you again for your interest in stdlib, and we look forward to reviewing your future contributions. ✨

[aayush0325]

good evening, heads up to everyone that i've started working on this issue.