feat-request(nominal-typebox): branded regexp fields

**Is your feature request related to a problem? Please describe.**
 - Support Typebox' `RegExp` branded alternative in `@coderspirit/nominal-typebox`.

**Describe the solution you'd like**

Same as for `brandedString`, but with `RegExp`.

**Describe alternatives you've considered**

Not applicable

**Additional context**

Not relevant.
