test(language-service): test project cleanup (#33157)

This PR adds es2015 lib to the `tsconfig.json` of the test project so
that `Promise` could be used. Note this only affects diagnostics in the
IDE. The tsconfig in Language Service Mock Host is the actual config
values used, and it already has es2015 lib.

- Other minor cleanup: Rename imports in `main.ts`.
- Add more cases to `parsing-cases.ts`, which are tested in later PRs

PR Close #33157

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

@@ -91,9 +91,22 @@ export class NumberModel {
   @Output('outputAlias') modelChanged: EventEmitter<number> = new EventEmitter();
 }
 
+@Component({
+  selector: 'foo-component',
+  template: `
+    <div string-model ~{string-marker}="text"></div>
+    <div number-model ~{number-marker}="value"></div>
+  `,
+})
+export class FooComponent {
+  text: string = 'some text';
+  value: number = 42;
+}
+
 interface Person {
   name: string;
   age: number;
+  street: string;
 }
 
 @Component({
@@ -125,6 +138,17 @@ export class ForUsingComponent {
   people: Person[] = [];
 }
 
+@Component({
+  template: `
+    <div *ngFor="let person of people | async">
+      {{person.~{async-person-name}name}}
+    </div>
+  `,
+})
+export class AsyncForUsingComponent {
+  people: Promise<Person[]> = Promise.resolve([]);
+}
+
 @Component({
   template: `
     <div #div>