InnerDetector: New ITk Strip classes supporting work for ATLITKSW-123

Merged James Smith requested to merge jlsmith/athena:dev/21.9/ATLITKSW-123 into 21.9

Initial work on ATLITKSW-123 introducing ITk Strip specific RDOs and Cluster objects to the InnerDetector module.

For now, these are simple copies of the existing SCT classes, and are not yet used anywhere, so should have no effect on existing code. In later merge requests, submodules in the InnerDetector module will be updated to use these new ITk classes instead of existing SCT classes. Once this is complete, the changes relevant to ATLITKSW-123 will be made, and logic used to intelligently choose between SCT and ITk_Strip.

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