feat(compiler): Added "strictMetadataEmit" option to ngc (#10951)

ngc can now validate metadata before emitting to verify it doesn't
contain an error symbol that will result in a runtime error if
it is used by the StaticReflector.

To enable this add the section,

  "angularCompilerOptions": {
    "strictMetadataEmit": true
  }

to the top level of the tsconfig.json file passed to ngc.

Enabled metadata validation for packages that are intended to be
used statically.

tools/@angular/tsc-wrapped/src/main.ts

@@ -50,7 +50,7 @@ export function main(
         // decorators which we want to read or document.
         // Do this emit second since TypeScript will create missing directories for us
         // in the standard emit.
-        const metadataWriter = new MetadataWriterHost(host, newProgram);
+        const metadataWriter = new MetadataWriterHost(host, newProgram, ngOptions);
         tsc.emit(metadataWriter, newProgram);
       }
     });