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

[kgryte]

Description

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

This method is the equivalent of the TypedArray.prototype.subarray 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 https://github.com/stdlib-js/stdlib/commit/956a4624c788689b1bca285856b987ea3aa32eb6, 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

• [X] I have read and understood the Code of Conduct.
• [X] Searched for existing issues and pull requests.

[stdlib-bot]

:rotating_light: Important: PLEASE READ :rotating_light:

This issue has been labeled as a good first issue and is available for anyone to work on.

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Before working on this issue and opening a pull request, please read the project's contributing guidelines. These guidelines and the associated development guide provide important information, including links to stdlib's Code of Conduct, license policy, and steps for setting up your local development environment.

To reiterate, we strongly encourage you to refer to our contributing guides before beginning work on this issue. Failure to follow our guidelines significantly decreases the likelihood that you'll successfully contribute to stdlib and may result in automatic closure of a pull request without review.

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• If you are attempting to contribute a new package, sometimes the best approach is to simply copy the contents of an existing package and then modify the minimum amount necessary to implement the feature (e.g., changing descriptions, parameter names, and implementation).
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In short, the more effort you put in to ensure that your contribution looks and feels like stdlib—including variables names, bracket spacing, line breaks, etc—the more likely that your contribution will be reviewed and ultimately accepted. We encourage you to closely study the codebase before beginning work on this issue.

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