Support using the names from named routes in `servant-foreign`

In many code generators one derives the name of the routes from their structure, such as `getUsersByIdByGroup` or something like that. It would be interesting if `servant-foreign` supported using the names coming from the routes when they are written as records when using `NamedRoutes`. That would allow for generated code that is easier to read and use.

For those who know the code, how big of a change would this be? Is there a precise point in the code where this name is chosen?