Posibility to receive channel-specific data of digitizer-block directly in order to configure range/scaling/offset

[alexxcons]

To configure range/scaling/offset, it is required to directly see the unmodified signal (without post-processing).

So it would be good to have e.g. a cascade Sink directly on each digitizer-channel.

Though that would generate a major performance penalty. So it should be possible to enable/disable these cascade sinks.

To be checked if it would be required to enable/disable them during runtime, or if re-loading the flowgraph would be sufficient.

(In the second case, this issue could be moved to https://gitlab.com/al.schwinn/DigitizerClass2)