Cannot remove channels/pvs by topic
Created by: matthew-d-jones
Use case brought up by Tobias:
That the remove cannot be scoped per topic will prevent us from using one forwarder instance for multiple instruments. I can see that we have to send some global accelerator PVs into many instrument topics. Not being able to configure per instrument is an issue then. (https://github.com/ess-dmsc/streaming-data-types/pull/57)
Don't forget to update the comments in the config update schema.