Make methods of SiSpacePointsSeedMaker_ITK const by defining EventData to hold event dependent data. (ATLASRECTS-3037)

Make methods of SiSpacePointsSeedMaker_ITK const by defining EventData to hold event dependent data.

• Define and use EventData to hold event dependent data.
• Implement event cache.
• Make methods const

These are important to run SiSPSeededTrackFinder in multi-threads.

• emplace_back is used instead of push_back if possible in SiSpacePointsSeedMaker_Cosmic and SiSpacePointsSeedMaker_HeavyIon. This is followup of MR !23322 (merged).

MR !23244 (merged) contains the corresponding changes to SiSpacePointsSeedMaker_ATLxk.