Add support for split modules in alignment

Following ATLIDTRKCP-519. Add use of (already implemented) addSplitAlignment so that ITk Strip modules which are split into multiple readout elements can have those elements sharing an AlignableTransform (the individual readout elements being part of the same silicon wafer, meaning they are physically bound together and should not be aligned with respect to one another).

This could also be used for any other case where the readout elements are not individually alignable.

FYI @xilin @sroe @pbruckma

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• 8f9250fe - actually evaluate split level, and fix releasing of XML strings

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• c2143ad4 - clearer debug messages

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@boudreau @tsulaia @rbianchi any objections?

Good! I was just looking this over and it looks fine. I'll merge.

mentioned in commit 6a6f8838

merged

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mentioned in merge request atlas/athena!72002 (closed)

mentioned in merge request atlas/athena!72003 (closed)