fix(ivy): types in .d.ts files should account for generics (#24862)

Ivy definition types have a generic type which specifies the return
type of the factory function. For example:

static ngDirectiveDef<NgForOf, '[ngFor][ngForOf]'>

However, in this case NgForOf itself has a type parameter <T>. Thus,
writing the above is incorrect.

This commit modifies ngtsc to understand the genericness of NgForOf and
to write the following:

static ngDirectiveDef<NgForOf<any>, '[ngFor][ngForOf]'>

PR Close #24862

packages/compiler/src/render3/view/api.ts

@@ -25,6 +25,11 @@ export interface R3DirectiveMetadata {
    */
   type: o.Expression;
 
+  /**
+   * Number of generic type parameters of the type itself.
+   */
+  typeArgumentCount: number;
+
   /**
    * A source span for the directive type.
    */