feat: add constants/float32/half-ln-two

[gunjjoshi]

Description

What is the purpose of this pull request?

This pull request:

• adds constants/float32/half-ln-two, which would be the single-precision equivalent for constants/float64/half-ln-two.
• is a pre-requisite for adding math/base/special/expm1f, which would be the single-precision equivalent for math/base/special/expm1.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves a part of [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.

No.

Checklist

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

• Read, understood, and followed the contributing guidelines.

---

@stdlib-js/reviewers

[Planeshifter]

LGTM!

[stdlib-bot]

PR Commit Message

feat: add `constants/float32/half-ln-two`

PR-URL: https://github.com/stdlib-js/stdlib/pull/3010
Ref: https://github.com/stdlib-js/stdlib/issues/649

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

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