no issue
- extracted most standalone util functions into separate files+tests
- switched the main `UrlUtils` function into a class (we had mixed uses of the returned object previously as both `urlUtils()` and `new UrlUtils()` - the class makes it obvious that the `new` keyword is required)
- removed some unnecessary use of lodash and switched to using `URL` in place of `url` so that the package can have parity across node+browser without needing an additional package bundled in
