B2OC: add Hlt2B2OC_B_SigmaNet_Run3.json for the B2OC Hlt2 generic B hadron NN

Alessandro Bertolinrequested to merge
b2oc-json4sigmanet into master

to be in place for testing:

lhcb/Moore!1414 (merged)

Edited by Alessandro Bertolin

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