[RFC]: Create `datasets/random` utilities for generating mock data

### Description

This RFC proposes to add a `@stdlib/datasets/random` namespace with packages for generating mock data.

- [ ] email
- [ ] firstName
- [ ] lastName
- [ ] streetAddress
- [ ] city
- [ ] country

All these utilities would likely support an `options` object parameter for control of what to return and sample from underlying datasets, which is why they should reside in `@stdlib/datasets`.

### Related Issues

None.

### 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:`.