enable version bumping for collaboration

src/element/mutateElement.ts

@@ -0,0 +1,20 @@
+import {
+  MutableExcalidrawElement,
+  MutableExcalidrawTextElement,
+} from "./types";
+
+export function mutateElement(
+  element: MutableExcalidrawElement,
+  callback: (mutatableElement: MutableExcalidrawElement) => void,
+): void {
+  element.version++;
+  callback(element);
+}
+
+export function mutateTextElement(
+  element: MutableExcalidrawTextElement,
+  callback: (mutatableElement: MutableExcalidrawTextElement) => void,
+): void {
+  element.version++;
+  callback(element);
+}