Draft: Decoding comparisons

Marian Stahlrequested to merge
mstahl_decoding_comparison into master

Sits on top of !835 (merged)

Goes with Moore!1602 (closed)

Adds/refactors decoding tests (currently UT hits and VP Retina).

Purpose: compare decoding outputs (LHCbID, hit positions...) of Allen with those of LHCb/Rec.

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