feat: add `iter/cusome-by`

[gururaj1512]

Resolves #2338.

Description

What is the purpose of this pull request? This pull request resolves issue #2338

This pull request:

• This pull request adds feature @stdlib/iter/cusome-by

Related Issues

Does this pull request have any related issues? I am new contributor to stdlib might need some guidance if something is wrong

This pull request:

• resolves https://github.com/stdlib-js/stdlib/issues/2338

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.

No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• [x] Read, understood, and followed the contributing guidelines

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