refactor: replace built-in with stdlib_base_atan2 in math/base/special/cphase

[gunjjoshi]

Description

What is the purpose of this pull request?

This pull request:

• completes the TODO to replace the use of built-in function with stdib_base_atan2 in math/base/special/cphase.
• updates benchmarks and tests to follow latest conventions.

Related Issues

Does this pull request have any related issues?

None.

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.

• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/cphase	$\color{green}137/137$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}137/137$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.

[Planeshifter]

Looking good, thanks!

[stdlib-bot]

PR Commit Message

refactor: replace built-in with `stdlib_base_atan2` in `math/base/special/cphase`

PR-URL: https://github.com/stdlib-js/stdlib/pull/3231

Reviewed-by: Philipp Burckhardt <[email protected]>

Please review the above commit message and make any necessary adjustments.