feat: add constants/float32/ln-two

[gunjjoshi]

Description

What is the purpose of this pull request?

This pull request:

• adds constants/float32/ln-two, which would be the single-precision equivalent for constants/float64/ln-two.
• unblocks the implementation of math/base/special/powf, which would be the single-precision equivalent for math/base/special/pow.

Related Issues

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None.

Questions

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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.

---

@stdlib-js/reviewers

[Planeshifter]

Thanks, @gunjjoshi!

[stdlib-bot]

PR Commit Message

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

PR-URL: https://github.com/stdlib-js/stdlib/pull/3079

Co-authored-by: 
Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>

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