Add ML jet clustering producer

[kpedro88]

The ongoing project to use ML for jet clustering can be introduced into CMSSW using a SonicTriton producer.

Particular considerations:

• Maintain consistency w/ existing fastjet usage in CMSSW (FastjetJetProducer, data types, etc.)
• Consider introducing ProcessModifier to enable the alternative sequence

Assigned to: @pierinim, @GaiaGrosso