Add a logging base class to Transport.Abstractions

[halter73]

It could be beneficial to have methods in a transport logging base class for logging events like connection resets. This could serve as a minimum guideline for what should be logged by new transports and better enable cross-transport testing.

An alternative might be to move the more transport-agnostic logging like Connection(Error|Reset|Pause|Resume) into the Core project

[muratg]

Won't fix.