feat: add `iter/cartesian-square`

[vinayak-00017]

Resolves #1334 .

Description

What is the purpose of this pull request? implements the package @stdlib/iter/cartesian-square.

This pull request:

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves #1334

Questions

Any questions for reviewers of this pull request?

No.

Other

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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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@stdlib-js/reviewers

[vinayak-00017]

I have made the changes you mentioned. Thanks for the review.

[kgryte]

@vinayak-00017 Are you still interested in working on this PR?

[vinayak-00017]

@vinayak-00017 Are you still interested in working on this PR?

I apologise, I might not be able to complete it.