Muon readout for Run 3
Re-introduces !159 (merged) (which was reverted) and also includes some fixes.
- needed for merge request lhcb/LHCb!3133 (merged) lhcb/Rec!2691 (merged) lhcb/Boole!377 (merged)
- need to be used along with DDDB!104 (merged)
Edited by Rosen Matev