[RFC]: add `constants/float32/ln-half`

[vivekmaurya001]

Description

This RFC proposes

• This RFC proposes adding the package @stdlib/constants/float32/ln-half returning Natural Logarithm of single-precision floating-point number 1/2.

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• I have read and understood the Code of Conduct.
• Searched for existing issues and pull requests.
• The issue name begins with RFC:.

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