21.9 initialization of hgtd digitization classes

This Merge Request aims to provide the basic structure for HGTD Digitization Tool so that the tool can be run from Reco_tf.py script.

This can provide the basis for future digitization and reconstruction development for HGTD.

This is a recreation of !39242 (closed).

ATLSWUPGR-86

Edited by Tadej Novak

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