info: output Dask-related information

[tiborsimko]

Current behaviour

After Dask workflow support has been added to REANA, the Python client info command replies with some Dask-related information to the user, whilst the Go client does not:

$ rc info | grep -i dask
The number of Dask workers created by default: 2
The amount of memory used by default by a single Dask worker: 2Gi
The maximum memory limit for Dask clusters created by users: 16Gi
The maximum amount of memory that users can ask for the single Dask worker: 8Gi
Dask workflows allowed in the cluster: True

$ rcg info | grep -i dask

Expected behaviour

REANA Go client should also output the Dask-related information, on parity with what the Python client does.