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Propagate backpressure to the transport channel #394

Backpressure of reactive commands, more specific the missing demand, is propagated to the channel. Reactive commands receive a batch of data and are queried whether they still have a demand for data or whether their demand is satisfied (because of no demand/saturated demand). A command without demand will disable further channel reads until the command is completed/canceled or signals further demand.

A significant amount of unread data will eventually cause the TCP receive buffer to overflow. This change moves the buffer responsibility away from the application into the operating system layer which requires then appropriate receive buffer sizing. On the other side, the application is protected against buffer overflows inside the application and reduces the memory footprint because of a reduced amount of data that is held inside the application.

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