feat: export mutation update from apollo

Author: wtrocki

packages/offix-cache/src/index.ts

@@ -5,3 +5,5 @@ export * from "./createOptimisticResponse";
 export * from "./createSubscriptionOptions";
 export * from "./api/CacheUpdates";
 export * from "./api/CacheOperation";
+
+export { MutationUpdaterFn } from "apollo-client";