Fine-grained verbosity control for Primary generator + Pythia8

[sawenzel]

Introduce configurable options to allow control
of log output of the primary generator and Pythia8 event generation.

By default, switch off a couple of messages that are repetetive and lead to large log files when we simulate many events.

This is meant for the use case of running the generators on-the-fly in hyperloop.

Allowing fine-grained control of output seems better than globally demoting from info to debug.

relates to https://its.cern.ch/jira/browse/O2-4681

[github-actions]

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