This allows the use of custom 'envelope' types like ActionResult<> with
a corresponding API Explorer implementation.
Basically this PR services to decouple a bunch of infrastructure from
ActionResult<>.
- #7413 part 1 of 2
- made all `ModelMetadataProvider` and `ObjectModelValidator`-specific code conditional
- fortunately, `MvcOptions` easy to get; affected code is primarily `internal` or pub-`Internal`
- remove unnecessary `ModelMetadataProvider` use in `ApiBehaviorApplicationModelProvider`
- run integration and functional tests with `CompatibilityVersion.Version_2_1`
- functional test change depends on @javiercn's recent #7541 fix
- remove test code now redundantly turning compatibility switches on
nits:
- correct spelling errors in `CompatibilitySwitch`
- take VS suggestions, mostly in test code
- rename methods in `ControllerBinderDelegateProviderTest` to match current API
- slightly refactor in `ApiBehaviorApplicationModelProvider`
- Updated our consumption of `RazorEngine` and `RazorTemplateEngine` to use `RazorProjectEngine` and its features.
- Updated service registrations to maintain existing services but to also register new ones.
- When moving `RazorViewEngine` to use `RazorProjectFileSystem` I had to add an unused constructor item in order to disambiguate the constructors.
- Updated tests to use `RazorProjectEngine` and `RazorProjectFileSystem`.
#7377
Ryan Nowak
Doug Bunting
N. Taylor Mullen
Pranav K
Javier Calvarro Nelson
Ajay Bhargav Baaskaran
Ryan Brandenburg
Jass Bagga