WIP: Add EventContext to bytestream IO interfaces
@tadej and @rafal expressed interest in bytestream IO services that provide the EventContext to the service. After reviewing the use of the ByteStreamInputSvc and ByteStreamOutputSvc interfaces it appears that this could well be done. For the moment I aim to keep the original interface there, in case I missed some use cases.
At the moment this only implements the changes for the input service interface. This WIP MR exists to allow for discussion on the changes. Still to do are: modification of the output interface and the calls to the service, providing the event context down the chain.