Allow Custom Acts::Logger object in high level functions (was ACTS-259)

Original author Valentin Volkl @vavolkl

When using ACTS in Gaudi, I need to construct a custom Acts::Logger to use the Framework logging. Some high-level functions like convertDD4hepGeometry, however, only take a LoggingLevel as argument and always construct the default Acts logger. Maybe there should be a possibility to alternatively pass a Acts::Logger argument.