refactor(cluster): export ClusterAdapterOptions and MessageType types

Related:

- https://github.com/socketio/socket.io-redis-streams-adapter/blob/89d00a49e4aadf1bfe32ddc644d0ef877a08238d/lib/adapter.ts#L17
- https://github.com/socketio/socket.io-redis-streams-adapter/blob/89d00a49e4aadf1bfe32ddc644d0ef877a08238d/lib/adapter.ts#L191

Author: darrachequesne

lib/index.ts

@@ -509,8 +509,10 @@ function shouldIncludePacket(
 export {
   ClusterAdapter,
   ClusterAdapterWithHeartbeat,
+  ClusterAdapterOptions,
   ClusterMessage,
   ClusterResponse,
+  MessageType,
   ServerId,
   Offset,
 } from "./cluster-adapter";