We need to implement a ServiceBusHubLifetimeManager. Some design questions:

• Do we use multiple topics hashing the connection id to pick a particular topic?
• Do we support partitioned topics?
• Do we use volatile topics by default?

Previous implementation:
https://github.com/SignalR/SignalR/blob/b73cbabe69bc48c4cb8d768148e157712a264ce9/src/Microsoft.AspNet.SignalR.ServiceBus3/ServiceBusConnection.cs