New energy regression model

[waredjeb]

This PR introduces the interface for the new regression model. The input preparation must be changed according to the model we will use.
Introduces also TICL from RECO!

Tested on the .pb file here: https://github.com/waredjeb/RecoHGCal-TICL/tree/test_new_energy_regression
energy_regression_test.pb

EDIT 13/05/22

• Adding new energy regression also in TracksterMergeProducer
• Temporarily adding RecoHGCal/TICL/data directory with .pb files

EDIT 27/06/22

• New model discussed here: https://indico.cern.ch/event/1170040/#8-energy-regression
• Model can be found here: https://github.com/waredjeb/RecoHGCal-TICL/blob/master/tf_models/energy_regression_tracksters.pb