chore(package): Add test watch script

Author: AndrzejSala

package.json

@@ -6,7 +6,8 @@
     "ng": "ng",
     "start": "ng serve",
     "build": "ng build filestack-angular",
-    "test": "ng test filestack-angular",
+    "test": "ng test filestack-angular --watch=false",
+    "test:watch": "ng test filestack-angular",
     "lint": "ng lint",
     "e2e": "ng e2e",
     "release": "ng test filestack-angular --watch=false && ng build filestack-angular && standard-version",