refactor(Type): merge Type and ConcreType<?> into Type<?> (#10616)

Closes #9729

BREAKING CHANGE:

`Type` is now `Type<T>` which means that in most cases you have to
use `Type<any>` in place of `Type`.

We don't expect that any user applications use the `Type` type.

modules/@angular/core/test/metadata/decorators_spec.ts

@@ -23,7 +23,7 @@ export function main() {
     });
 
     it('should create type in ES5', () => {
-      function MyComponent(){};
+      class MyComponent {};
       var as: any /** TODO #9100 */;
       (<any>MyComponent).annotations = as = Component({});
       expect(reflector.annotations(MyComponent)).toEqual(as.annotations);