v2.0.0 Refactor with TypeScript & Nest.js

Features

1. support emoji changed notification 🍿
2. support teammate join notification 🙌
3. support user delete notification 🥹
4. support user status changed notification 🔔
5. support channel archive notification 📣
6. support channel created notification 💪
7. support watch command 👀
8. support message command ✉️
9. support anonymous speaking 🙊