ITS-GPU: various fixes + separate vertexing kernels

[mconcas]

• Staging
• Move vertexer kernels away from the traits
• Fix GPU APIs compatibility
• Fix Hybrid interfaces for CPU
• Checkpoint work
• Unregister memory in sync and async when iteration == par.size()-1
• Fix USEMatCorrNONE case in gpu fit
• Update usage
• Make TrackingFrameInfo array const
• Update methods

[github-actions]

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[mconcas]

CI is green; this fixes a couple of bugs in GPU tracking and adds kernel separation for vertexing so that it can be merged already.
More cleanup and feature restoration on the GPU part will come in next PRs.