[RFC]: add C implementation for `number/uint32/base/to-int32`

### Description

This RFC proposes adding C implementation for [`number/uint32/base/to-int32`](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/number/uint32/base/to-int32).

This is a pre-requisite for the C implementation of [`stdlib/math/base/special/pow`](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/pow).

### 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:`.

Start with the linked number/uint32/base/to-int32 package directory and review the requirements for its proposed C implementation. Check related issue #649 and the dependency on the C implementation of stdlib/math/base/special/pow; done means the target implementation is added and supports that prerequisite.

Vom Indexierungsmodell aus dem Issue-Text verfasst.