Add monitoring groups python access to TrigConfIO

Merged Benedict Allbrooke requested to merge ballbroo/athena:AddMonGroups into master

Implements monitoring groups access into TrigConfIO needed to be able to switch on offline monitoring.

This just implements the Python access. cxx changes stashed for a future MR.

Tagging @mark @astruebi @palacino

Edited by Benedict Allbrooke

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