build(ngc): run integration test hermetically

This ensures we run in a clean directory, using our real distribution. It finds bugs like @internal
APIs needed to type-check in the offline compiler, as well as problems in package.json.

Also move tsc-wrapped under tools/@angular

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

@@ -0,0 +1,20 @@
+import * as ts from 'typescript';
+
+interface Options extends ts.CompilerOptions {
+  // Absolute path to a directory where generated file structure is written
+  genDir: string;
+
+  // Path to the directory containing the tsconfig.json file.
+  basePath: string;
+
+  // Don't produce .metadata.json files (they don't work for bundled emit with --out)
+  skipMetadataEmit: boolean;
+
+  // Don't produce .ngfactory.ts or .css.shim.ts files
+  skipTemplateCodegen: boolean;
+
+  // Print extra information while running the compiler
+  trace: boolean;
+}
+
+export default Options;