FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

node_modules/@msgpack/msgpack/dist/ExtData.d.ts

@@ -0,0 +1,8 @@
+/**
+ * ExtData is used to handle Extension Types that are not registered to ExtensionCodec.
+ */
+export declare class ExtData {
+    readonly type: number;
+    readonly data: Uint8Array;
+    constructor(type: number, data: Uint8Array);
+}