chore(ngc): refactor out tsc-wrapped

This allows angular's build to depend on some extensions, but not on code generation, and breaks a cycle in the angular build
We now merge ts-metadata-collector into tsc-wrapped and stop publishing the former.

tools/broccoli/broccoli-typescript.ts

@@ -3,7 +3,7 @@ import fse = require('fs-extra');
 import path = require('path');
 import * as ts from 'typescript';
 import {wrapDiffingPlugin, DiffingBroccoliPlugin, DiffResult} from './diffing-broccoli-plugin';
-import {MetadataCollector} from '../ts-metadata-collector';
+import {MetadataCollector} from '../tsc-wrapped';
 
 type FileRegistry = ts.Map<{version: number}>;