Explicit "contribution" API for easier expansion of DI collections and maps

Currently extending Cayenne via contribution to DI collections and maps is not easy, as locating the corresponding map/collection is not transparent. It requires the knowledge of a String key for a given collection, and doesn't tell the user the type of the objects in the collection. E.g.:

binder
                .bindList(Constants.SERVER_DEFAULT_TYPES_LIST)
                .add(new LocalDateType())
                .add(new LocalTimeType())
                .add(new LocalDateTimeType());

Let's wrap this in a static contribution API similar to what was developed in bootique.io. E.g.:

BQCoreModule.contributeExtendedTypes(binder).add(..).add(..)

This way the users will have explicit API to access all module collections / maps and will know the type of objects they expect.