Build a new connection with the builder function.
Build a new connection with the builder function. The returned
Future[T] will not resolve until after the Future[T] generated
by builder has resolved, which is the same time which channel
events will begin to happen.
PushSessionTransporters attempt to construct a PushChannelHandle and provide it to the factory function, returning any errors as failed
Futures.There is one PushTransporter assigned per remote peer.