Add JsonFormsAbstractControl to exported classes

The JsonFormsAbstractControl was not exported by the angular package.
This lead to duplicate instances of the angular package when using the
ArrayLayoutRenderer and thus to the ArrayLayoutRenderer not working.
By not using a deep import in the ArrayLayoutRenderer only one instance
of the angular package exists.

Fix #1781

Author: eneufeld

packages/angular-material/src/layouts/array-layout.renderer.ts

@@ -28,8 +28,7 @@ import {
   OnDestroy,
   OnInit
 } from '@angular/core';
-import { JsonFormsAngularService } from '@jsonforms/angular';
-import { JsonFormsAbstractControl } from '@jsonforms/angular/lib/abstract-control';
+import { JsonFormsAngularService, JsonFormsAbstractControl } from '@jsonforms/angular';
 import {
   ArrayLayoutProps,
   createDefaultValue,

packages/angular/src/index.ts

@@ -30,3 +30,4 @@ export * from './jsonforms.module';
 export * from './unknown.component';
 export * from './jsonforms.service';
 export * from './jsonforms-root.component';
+export * from './abstract-control';