get BeamInfo api
Created by: JieNanMAXIV
have tested with HardwareObjects 2.2 (both mockup and MAXIV env), 2.1 mockup (but with minor changes, see the PR for diffractometerMockup)
Created by: JieNanMAXIV
have tested with HardwareObjects 2.2 (both mockup and MAXIV env), 2.1 mockup (but with minor changes, see the PR for diffractometerMockup)