[RFC]: Add implementation for `@stdlib/math/base/special/boxcoxf`

### Description

### Description
This RFC proposes adding JS and C implementations for `@stdlib/math/base/special/boxcoxf`

### Related Issues

#649

### Questions

No.

### Other

No.

### Checklist

- [x] I have read and understood the [Code of Conduct](https://github.com/stdlib-js/stdlib/blob/develop/CODE_OF_CONDUCT.md).
- [x] Searched for existing issues and pull requests.
- [x] The issue name begins with `RFC:`.

Start by reading this RFC and the related issue #649. The payload does not identify implementation files or tests, so first determine the expected JS and C entry points and existing conventions for this math function. Done means both proposed implementations are added and covered by the project's applicable tests.

Scritto dal modello di indicizzazione a partire dal testo della issue.