feat: add constants/float16/glaisher-kinkelin

[parthodas23]

Resolves none.

Description

What is the purpose of this pull request?

This pull request:

• This PR adds the constants/float16/glaisher-kinkelin package and it uses float64ToFloat16 to ensure the constant is correctly rounded to half-precision.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: tracking issue for missing float16 constants #9061

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.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

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• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

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{{TODO: add disclosure if applicable}}

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Coverage Report

Package	Statements	Branches	Functions	Lines
constants/float16/glaisher-kinkelin	$\color{green}53/53$ $\color{green}+100.00%$	$\color{green}1/1$ $\color{green}+100.00%$	$\color{green}0/0$ $\color{green}+100.00%$	$\color{green}53/53$ $\color{green}+100.00%$

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