Introduce ActsGeoUtils package

Hi everybody,

on request of @ncalace, I am moving a couple of geometry methods which are inside the MuonPhaseII realm into a dedicated package hosted in the Acts tracking world.

• Add compiler directives that allow to comiple ActsGeometryInterfaces & ActsGeoUtils in AthSimulation. Acts is not part of the build, yet. But we need the MuonGeoModelR4 & MuonReadoutGeometryR4 package to run the Run 4 geometry there. Actually, we only need the ActsGeometryContext from ActsGeometryIntefaces, I hope...