This pull request includes several improvements and bug fixes across multiple files. The most important changes include enabling Deno in the VSCode settings, updating the changelog with a new release, fixing a bug in the WebSocket transport, and enhancing compatibility in the msgpack library.

Configuration Updates:

• .vscode/settings.json: Enabled Deno by setting "deno.enable": true.

Documentation Updates:

• CHANGELOG.md: Added release notes for version 0.2.1, including a bug fix for the engine.

Bug Fixes:

• packages/engine.io/lib/transports/websocket.ts: Added a check for readyState before sending packets in the WebSocket transport.

Compatibility Enhancements:

• packages/msgpack/lib/decode.ts: Modified the _buffer type to accept ArrayBuffer or SharedArrayBuffer.
• packages/msgpack/lib/encode.ts: Updated the _bin type to accept ArrayBuffer or ArrayBufferLike and changed keys to be of type any[]. [1] [2]

Code Cleanup:

• packages/socket.io/lib/parent-namespace.ts: Removed commented-out adapter code from the ParentNamespace class.
• packages/socket.io/lib/server.ts: Ensured ServerReservedEvents interface types extend EventsMap.

Fixes Issue