Write the number of parallel processes in DAG visualization report

[blacky0x0]

Definition & Scenario

I ran the blast-parallel.nf example with -with-dag option and noticed that parallel processes were collapsed to a single item in a DAG report.
While studying it'd be great to see the exact graph that is built but I guess it's a little bit hard to implement. So, at least, specifying the number of parallel processes on the icon will be useful.

Suggested implementation

Add additional scope to be able to configure:

dag_visualization {
   show_parallel_processes_number = true
}

Text example:

blast [5]
   v
extract [5]
   v
 aligh

Image example:

[stale]

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