[RFC]: add implementation of ```math/base/special/minmaxabsf```

### Description

This RFC proposes to add implementation of ```math/base/special/minmaxabsf```

### Related Issues

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:`.

The issue names no files, tests, or entry points. Start by reading this RFC and related issue #649, then confirm the requested scope and acceptance criteria with project maintainers; completion depends on an agreed implementation of math/base/special/minmaxabsf.

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