feat: add C implementation for math/base/special/gamma

[gunjjoshi]

Description

What is the purpose of this pull request?

This pull request:

• adds C implementation for math/base/special/gamma.

double stdlib_base_gamma( const double x );

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

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No.

Other

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No.

Checklist

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[Pranavchiku]

This PR looks good, once the changes are done this will be ready to merge. Also the above changes are minor, I am not exactly sure which has higher precision but I think the suggested one has. Here is my discussion with chatGPT, https://chatgpt.com/share/d247d6fe-6321-49b7-a469-a92d0ab38b18

[Planeshifter]

Let's land this! 🚀