feat: add .ngsummary.ts files to support AOT unit tests

Design doc: https://docs.google.com/document/d/1VmTkz0EbEVSWfEEWEvQ5sXyQXSCvtMOw4t7pKU-jOwc/edit?usp=sharing

packages/compiler/src/aot/compiler_host.ts

@@ -14,14 +14,6 @@ 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|null;
-
   /**
    * Loads a resource (e.g. html / css)
    */