rumqttc | Unbounded channel

[carlocorradini]

At the moment, the only way to construct a client is to provide a fixed client capacity. A client with unlimited channel capacity would be desirable. Furthermore, the pure implementation is already available because rumqttc is built on flume. The client/event_loop has to be refactored in order to enable support for both bounded and unbounded channels. Let me know what you think 🤯