Draft: proc: Decouple orbit parsing and processing

Giovanna Lazzari Miottorequested to merge
glazzari/ref/orbitwise-processing into main

This draft MR rewrites the main processing loops in OrbitProcessor to isolate parsing from processing. In addition, a new virtual function ProcessContiguousBlocks (name pending change) unrolls the usual per-BX processing to enable bulk processing of all bunch crossings in an orbit.

Note that only the GMT processor has been implemented and tested while the branch remains in development - do not run with other processors.

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