Implement 'you have unsaved changes' (#850)

skyvern-frontend/src/store/WorkflowHasChangesStore.ts

@@ -0,0 +1,13 @@
+import { create } from "zustand";
+
+type WorkflowHasChangesStore = {
+  hasChanges: boolean;
+  setHasChanges: (hasChanges: boolean) => void;
+};
+
+const useWorkflowHasChangesStore = create<WorkflowHasChangesStore>((set) => ({
+  hasChanges: false,
+  setHasChanges: (hasChanges) => set({ hasChanges }),
+}));
+
+export { useWorkflowHasChangesStore };