WIP - Add system notifications for document upload progress/status

lib/features/tasks/cubit/task_status_cubit.dart

@@ -0,0 +1,26 @@
+import 'package:bloc/bloc.dart';
+import 'package:equatable/equatable.dart';
+import 'package:paperless_api/paperless_api.dart';
+part 'task_status_state.dart';
+
+class TaskStatusCubit extends Cubit<TaskStatusState> {
+  final PaperlessTasksApi _api;
+  TaskStatusCubit(this._api) : super(const TaskStatusState());
+
+  void startListeningToTask(String taskId) {
+    _api
+        .listenForTaskChanges(taskId)
+        .forEach(
+          (element) => TaskStatusState(
+            isListening: true,
+            isAcknowledged: false,
+            task: element,
+          ),
+        )
+        .whenComplete(() => emit(state.copyWith(isListening: false)));
+  }
+
+  void acknowledgeCurrentTask() {
+    emit(state.copyWith(isListening: false, isAcknowledged: true));
+  }
+}