Proper Modelling of Pixel Quad Modules [ATLITKSW-114]

These changes implement a proper modelling of pixel quad modules in the ITk as discussed in ATLITKSW-114, along with the changes to the XML descriptions in Atlas-Inner-Tracking/ITKLayouts!20.

As described in the Jira ticket, I generalized the procedure, by which the matrix of diodes on pixel modules is created to account for the geometry of the RD53 module used in ITk. This is particularly important for the inter-chip region, where larger pixel sizes are used.

Pinging @nstyles @tlari @tstreble @ncalace

Closes ATLITKSW-114

These are the same changes as in !32189 (merged) (which was reverted in !32998 (merged)) extended by fixes to bugs in the original MR.