Revert "refactor(compiler-cli): expose ngtools api separately (#18952)"

This reverts commit 1953e2af7a.

packages/compiler-cli/src/transformers/api.ts

@@ -250,6 +250,13 @@ export interface Program {
    */
   loadNgStructureAsync(): Promise<void>;
 
+  /**
+   * Retrieve the lazy route references in the program.
+   *
+   * Angular structural information is required to produce these routes.
+   */
+  getLazyRoutes(cancellationToken?: ts.CancellationToken): {[route: string]: string};
+
   /**
    * Emit the files requested by emitFlags implied by the program.
    *

packages/compiler-cli/src/transformers/program.ts

@@ -134,6 +134,8 @@ class AngularCompilerProgram implements Program {
         });
   }
 
+  getLazyRoutes(cancellationToken?: ts.CancellationToken): {[route: string]: string} { return {}; }
+
   emit({emitFlags = EmitFlags.Default, cancellationToken, customTransformers,
         emitCallback = defaultEmitCallback}: {
     emitFlags?: EmitFlags,