Pure rust [MQTT] client

What is supported

• [x] QoS 0, 1, 2
• [x] Tls (Uses RustTLS by default for TLS. Cross compilation and multi platform support is painless)
• [x] Automatic Reconnection
• [x] Dynamic Reconnection
• [x] Back pressure when the connection is slow
• [x] Incoming notifications on crossbeam channel
• [x] Pause/Resume network io

What's not supported

• [ ] Cancelling mqtt will with disconnect packet