* Relayer MvcEndpointDataSource
Separates the statefulness of the data source from the business logic of
how endpoints are created.
I'm separating these concerns because one of the next steps will split
the MvcEndpointDataSource into two data sources.
* Simplify MvcEndpointInfo
Removing things that are unused and leftovers from the 2.2 design of
this feature.
* Remove per-route conventions
Removes the ability to target endpoint conventions
per-conventional-route. This was a neat idea but we have no plans to
ship it for now.
Simplified MvcEndpointInfo and renamed it to reflect its new purpose.
* Remove filtering from MvcEndpointDataSource
This was neat-o but we're not going to ship it like this. We're going to
implement filtering in another place. Putting this in the data source is
pretty clumsy and doesn't work with features like application parts that
need to be baked in addservices
* Simplify ActionEndpointFactory
* Split up data sources
* Use UseRouting in functional tests
I've rejiggered our functional tests to de-emphasize UseMvc(...) and
only use it when we're specifically testing the old scenarios.
UseMvc(...) won't appear in templates in 3.0 so it's legacy.
* Update templates
* Add minor PR feedback
* one more
Ryan Nowak
Chris Ross
Ryan Brandenburg