[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.

Written by the indexing model from the issue text.