adding editing assignment groups

nextjs/src/models/canvas/assignments/canvasAssignmentGroup.ts

@@ -0,0 +1,10 @@
+export interface CanvasAssignmentGroup {
+  id: number;  // TypeScript doesn't have `ulong`, so using `number` for large integers.
+  name: string;
+  position: number;
+  group_weight: number;
+  // sis_source_id?: string;  // Uncomment if needed.
+  // integration_data?: Record<string, string>;  // Uncomment if needed.
+  // assignments?: CanvasAssignment[];  // Uncomment if needed, assuming CanvasAssignment is defined.
+  // rules?: any;  // Assuming 'rules' is of unknown type, so using 'any' here.
+}