Trace message flows

[kimbirkelund]

This is actually two related features:

1. Given a message trace which message it resulted from and which were generated from it (preferable taking sagas into account)
2. Given a message type visualize the general flow of messages in the system (again including sagas)

In my minds eye I imagine some kind of flowchart like

or maybe something like this

where the thickness of arrows indicate the number of messages.

When I say "including sagas" I mean the visualization should have a box for a saga-instance/-type with boxes for handlers inside it. This would also make it easily identifiable that some messages are "private" to a saga.