feat: implement task group actions

- allow sorting specifc task groups
- duplicate task group
- delete all tasks in task group

frontend/src/shared/graphql/taskGroup/sortTaskGroup.ts

@@ -0,0 +1,13 @@
+import gql from 'graphql-tag';
+
+const SORT_TASK_GROUP_MUTATION = gql`
+  mutation sortTaskGroup($tasks: [TaskPositionUpdate!]!, $taskGroupID: UUID!) {
+    sortTaskGroup(input: { taskGroupID: $taskGroupID, tasks: $tasks }) {
+      taskGroupID
+      tasks {
+        id
+        position
+      }
+    }
+  }
+`;