Support Redis Streams as lower transport layer

[achimnol]

This will make a peer scalable to multiple cores & servers.

[temirrr]

During implementation of the Redis Streams as lower transport layer, I also implemented its cancellation mechanism. As now that code is under PR review, I am not sure whether it will be merged. However, if it gets merged, I want to note that there were problems with cancellation for RedisStreams (which was not the case for ZeroMQ transport). So I think the deeper look at the operation of RedisStreams needs to be taken.

Unfortunately, I could not solve that problem and dig down to its root, even though I tried a lot.