Import of tau RNN track classification from master to 21.3

Bertrand Martin Dit Latourrequested to merge
martindl/athena:21.3_TauTrackRNN_FollowUp into 21.3

Hello,

This MR is basically importing to 21.3 some code that has just been added to master in !26712 (merged) . This new tau algorithm will be needed for Run3 trigger studies. Raw copy, no modification for this round.

Cheers, Bertrand

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