revert: refactor(ivy): make return value of define(Component|Directive|Pipe|Injector|Injectable) private (#23371)

This reverts commit 2c09b707ce.

packages/core/src/metadata/ng_module.ts

@@ -6,14 +6,13 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {InjectorType, defineInjector, ɵInjectorDef} from '../di/defs';
+import {InjectorDef, InjectorType, defineInjector} from '../di/defs';
 import {convertInjectableProviderToFactory} from '../di/injectable';
 import {Provider} from '../di/provider';
 import {Type} from '../type';
 import {TypeDecorator, makeDecorator} from '../util/decorators';
 
 
-
 /**
  * A wrapper around a module that also includes the providers.
  *