ALICE3-TRK: first version of working digitizer

[atriolo]

First working version of the digitizer: given an input hits file, the code now produces trkdigits.root containing the digits.

• The roto-translation matrices are now correctly retrieved from the geometry, using the updated detector ID
• A simple segmentation of the sensitive parts of the detector is now defined
• Using the APTS response file to obtain the response function
• Added methods to switch between curved and flat coordinates for the curved VD layers to match the response file coordinate system
• Setting digitization parameters
• Scaling the pitch and depth of the O2 geometry elements to match those of the APTS response file

[github-actions]

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[njacazio]

Ciao @atriolo many thanks, I think the PR also has to be approved from @shahor02

[shahor02]

Hi, I am not particularly familiar with detector details and while I am certainly interested to learn them, it will take some time for me to understand the PR. So, if it is pressing, please don't wait for my approval.