refactor(compiler): introduce directive wrappers to generate less code

- for now only wraps the `@Input` properties and calls
  to `ngOnInit`, `ngDoCheck` and `ngOnChanges` of directives.
- also groups eval sources by NgModule.

Part of #11683

modules/@angular/compiler/index.ts

@@ -44,6 +44,7 @@ export * from './src/metadata_resolver';
 export * from './src/ml_parser/html_parser';
 export * from './src/ml_parser/interpolation_config';
 export {NgModuleCompiler} from './src/ng_module_compiler';
+export {DirectiveWrapperCompiler} from './src/directive_wrapper_compiler';
 export * from './src/output/path_util';
 export * from './src/output/ts_emitter';
 export * from './src/parse_util';