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

modules/@angular/platform-browser-dynamic/test/xhr/xhr_cache_spec.ts

@@ -8,7 +8,7 @@
 
 import {UrlResolver, XHR} from '@angular/compiler';
 import {Component} from '@angular/core';
-import {TestComponentBuilder, configureCompiler, fakeAsync, flushMicrotasks, tick} from '@angular/core/testing';
+import {TestBed, TestComponentBuilder, fakeAsync, flushMicrotasks, tick} from '@angular/core/testing';
 import {AsyncTestCompleter, beforeEach, beforeEachProviders, ddescribe, describe, iit, inject, it, xit} from '@angular/core/testing/testing_internal';
 import {expect} from '@angular/platform-browser/testing/matchers';
 
@@ -26,7 +26,7 @@ export function main() {
       return new CachedXHR();
     }
     beforeEach(() => {
-      configureCompiler({
+      TestBed.configureCompiler({
         providers: [
           {provide: UrlResolver, useClass: TestUrlResolver},
           {provide: XHR, useFactory: createCachedXHR}

modules/@angular/platform-browser-dynamic/testing.ts

@@ -9,7 +9,7 @@
 import {CompilerConfig, DirectiveResolver, NgModuleResolver, analyzeAppProvidersForDeprecatedConfiguration} from '@angular/compiler';
 import {OverridingTestComponentBuilder, platformCoreDynamicTesting} from '@angular/compiler/testing';
 import {Compiler, CompilerFactory, CompilerOptions, NgModule, PlatformRef, Provider, ReflectiveInjector, Type, createPlatform, createPlatformFactory} from '@angular/core';
-import {TestComponentBuilder, TestComponentRenderer, initTestEnvironment} from '@angular/core/testing';
+import {TestBed, TestComponentBuilder, TestComponentRenderer} from '@angular/core/testing';
 import {BrowserTestingModule, platformBrowserTesting} from '@angular/platform-browser/testing';
 
 import {Console} from './core_private';
@@ -62,7 +62,7 @@ export const TEST_BROWSER_DYNAMIC_PLATFORM_PROVIDERS: Array<any /*Type | Provide
       class DynamicTestModule {
       }
 
-      const testInjector = initTestEnvironment(DynamicTestModule, platformRef);
+      const testInjector = TestBed.initTestEnvironment(DynamicTestModule, platformRef);
       const console: Console = testInjector.get(Console);
       deprecatedConfiguration.deprecationMessages.forEach((msg) => console.warn(msg));
     }];