feat(compiler): use typescript for resolving resource paths

This can also be customized via the new method `resourceNameToFileName` in the
`CompilerHost`.

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

@@ -315,6 +315,10 @@ class AotCompilerHostImpl extends BaseAotCompilerHost<CompilerHost> {
     return this.context.fileNameToModuleName(importedFile, containingFile);
   }
 
+  resourceNameToFileName(resourceName: string, containingFile: string): string|null {
+    return this.context.resourceNameToFileName(resourceName, containingFile);
+  }
+
   toSummaryFileName(fileName: string, referringSrcFileName: string): string {
     return this.context.toSummaryFileName(fileName, referringSrcFileName);
   }