[RFC]: add `array/base/broadcasted-quinary3d`

[kgryte]

Description

This RFC proposes adding a new package to the array/base/* namespace: @stdlib/array/base/broadcasted-quinary3d.

This package is the quinary equivalent of @stdlib/array/base/broadcasted-binary3d.

To provide a concrete example of what a PR adding the desired package should contain, see @stdlib/array/base/broadcasted-quinary2d, which is the 2D package equivalent.

While the package proposed in this RFC will 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]

🚨 Important: PLEASE READ 🚨

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

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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.

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