feat(@angular-devkit/build-angular): export protractor builder

Author: minijus

packages/angular_devkit/build_angular/src/index.ts

@@ -49,6 +49,11 @@ export {
   KarmaConfigOptions,
 } from './karma';
 
+export {
+  execute as executeProtractorBuilder,
+  ProtractorBuilderOptions,
+} from './protractor';
+
 export {
   execute as executeServerBuilder,
   ServerBuilderOptions,

packages/angular_devkit/build_angular/src/protractor/index.ts

@@ -76,7 +76,9 @@ async function updateWebdriver() {
   } as unknown as JSON);
 }
 
-async function execute(
+export { ProtractorBuilderOptions };
+
+export async function execute(
   options: ProtractorBuilderOptions,
   context: BuilderContext,
 ): Promise<BuilderOutput> {