feat: add implementation of math/base/special/round2f function

[sahil20021008]

Resolves #6734 .

Description

What is the purpose of this pull request?

This pull request:

• This pull request adds round2f implementation to stdlib. This includes benchmarks, lib files, tests, examples, src files, README, etc

Related Issues

Does this pull request have any related issues?

This pull request:

• progresses [RFC]: Add C implementations to base special math functions (tracking issue) #649

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.

Currently, this pull request is dependant on the implementation of powf and log2f implementation. I will update this pull request after those 2 PRs 5739 and 4179 have been merged.

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

[sahil20021008]

/stdlib help

[stdlib-bot]

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[sahil20021008]

/stdlib update-copyright-years