feat: add form dialog component (#428)

- Add formfield, input, select base (model)
- Add formfield component
- Add form-group service
- Add form-dialog component

Fixes: #427

src/app/shared/form-dialog/form-group.service.spec.ts

@@ -0,0 +1,12 @@
+import { TestBed } from '@angular/core/testing';
+
+import { FormGroupService } from './form-group.service';
+
+describe('FormGroupService', () => {
+  beforeEach(() => TestBed.configureTestingModule({}));
+
+  it('should be created', () => {
+    const service: FormGroupService = TestBed.get(FormGroupService);
+    expect(service).toBeTruthy();
+  });
+});