[RFC]: Add C implementtation for `@stdlib/math/base/special/factorial`

[anirudhprabhakaran3]

Description

This RFC proposes adding C implementation for @stdlib/math/base/special/factorial

Related Issues

Helps progress #649

Questions

No.

Other

No.

Checklist

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

[anirudhprabhakaran3]

This is blocked because C implementation for @stdlib/math/base/special/gamma does not exist yet.

[gunjjoshi]

We can close this now, it has been completed by #2618.