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/src/aot/compiler_host.ts

@@ -14,6 +14,13 @@ import {AotSummaryResolverHost} from './summary_resolver';
  * services and from underlying file systems.
  */
 export interface AotCompilerHost extends StaticSymbolResolverHost, AotSummaryResolverHost {
+  /**
+   * Converts a file path to a module name that can be used as an `import.
+   * I.e. `path/to/importedFile.ts` should be imported by `path/to/containingFile.ts`.
+   *
+   * See ImportResolver.
+   */
+  fileNameToModuleName(importedFilePath: string, containingFilePath: string): string;
   /**
    * Converts a path that refers to a resource into an absolute filePath
    * that can be later on used for loading the resource via `loadResource.