refactor(language-service): Return directive defs when input name is part of selector (#39243)

When an input name is part of the directive selector, it would be good to return the directive as well
when performing 'go to definition' or 'go to type definition'. As an example, this would allow
'go to type definition' for ngIf to take the user to the NgIf directive.
'Go to type definition' would otherwise return no results because the
input is a generic type. This would also be the case for all primitive
input types.

PR Close #39243

packages/language-service/test/project/app/main.ts

@@ -25,6 +25,7 @@ import * as ParsingCases from './parsing-cases';
     ParsingCases.TestPipe,
     ParsingCases.WithContextDirective,
     ParsingCases.CompoundCustomButtonDirective,
+    ParsingCases.EventSelectorDirective,
   ]
 })
 export class AppModule {

packages/language-service/test/project/app/parsing-cases.ts

@@ -75,6 +75,11 @@ export class CompoundCustomButtonDirective {
   @Input() config?: {color?: string};
 }
 
+@Directive({selector: '[eventSelector]'})
+export class EventSelectorDirective {
+  @Output() eventSelector = new EventEmitter<void>();
+}
+
 @Pipe({
   name: 'prefixPipe',
 })