feat: add implementation of math/base/special/binomcoeff

[NishchayRajput]

Ref: #649

Description

What is the purpose of this pull request?

This pull request:

• Add implementation of math/base/special/binomcoeff

Related Issues

Does this pull request have any related issues?

This pull request:

• Ref: [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]

⚠️ Tracking Issue Closure Warning ⚠️

I noticed your PR description contains closing keywords ("Resolves", "Closes", or "Fixes") referencing a "Tracking Issue".

Why this matters:
Tracking issues should typically remain open until all related sub-issues are completed. GitHub automatically closes issues with such closing keywords when the PR is merged.

Required action:
Use "Progresses:" or "Ref:" instead to reference the tracking issue without automatically closing it.

Thank you for your contribution to the project!

[anandkaranubc]

Referring to the conversation on Gitter, this is what you can use:

Suggested change

	n = round.( Int, ( rand( 1000 ) .* 50 ) .+ 20 );
	n = round.( Int, ( rand( 1000 ) .* 5 ) .+ 20 );

Similarly, this applies to negative n values as well.

[anandkaranubc]

Completed via #7000