refactor(testing): introduce new testing api to support ng modules

BREAKING CHANGE:
- deprecations:
  * `withProviders`, use `TestBed.withModule` instead
  * `addProviders`, use `TestBed.configureTestingModule` instead
  * `TestComponentBuilder`, use `TestBed.configureTestModule` / `TestBed.override...` / `TestBed.createComponent` instead.

Closes #10354

test-main.js

@@ -75,7 +75,7 @@ System.import('@angular/core/testing')
   .then(function(coreTesting){
     return System.import('@angular/platform-browser-dynamic/testing')
       .then(function(browserTesting) {
-         coreTesting.initTestEnvironment(
+         coreTesting.TestBed.initTestEnvironment(
            browserTesting.BrowserDynamicTestingModule,
            browserTesting.platformBrowserDynamicTesting());
       });