Reverted back to unexpected removal of installed_apps section

Author: SanoopC

sift/src/main/json/mobile_event.yaml

@@ -60,6 +60,18 @@ properties:
       evidence_properties: {type: array, items: {type: string}, required: false}
       evidence_directories_writable: {type: array, items: {type: string}, required: false}
 
+      installed_apps:
+        type: array
+        required: false
+        items:
+          type: object
+          javaType: com.sift.api.representations.AndroidInstalledAppJson
+          required: false
+          additionalProperties: false
+          properties:
+            package_name: {type: string, required: false}
+            app_name: {type: string, required: false}
+
   android_app_state:
     scope: public
     type: object