refactor(compiler): remove old ngtools api and add listLazyRoutes to new api (#19836)

Usages of `NgTools_InternalApi_NG_2` from `@angular/compiler-cli` will now
throw an error.

Adds `listLazyRoutes` to `@angular/compiler-cli/ngtools2.ts` for getting
the lazy routes of a `ng.Program`.
PR Close #19836

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

@@ -11,6 +11,7 @@ import * as ts from 'typescript';
 import {DEFAULT_ERROR_CODE, Diagnostic, SOURCE} from './api';
 
 export const GENERATED_FILES = /(.*?)\.(ngfactory|shim\.ngstyle|ngstyle|ngsummary)\.(js|d\.ts|ts)$/;
+export const DTS = /\.d\.ts$/;
 
 export const enum StructureIsReused {Not = 0, SafeModules = 1, Completely = 2}