Provide an optional enum path converter.

[bckohan]

https://docs.djangoproject.com/en/stable/topics/http/urls/#path-converters

[bckohan]

Because path converters are regex based, supporting an enum path converter for arbitrary enums is difficult, especially if symmetricity is to be honored. Closing this as wont fix for now... may revisit in the future.

[bckohan]

Reviving this - should be able to dynamically build the regex from list of strings and offer a type factory for enum converters.