Implement StaticObjectType in entity_properties
Backward compatible extension to be able to map static object type input from scenario languages (here OpenSCENARIO XML MiscObjectCategory) to OSI output. See also https://opensimulationinterface.github.io/open-simulation-interface/structosi3_1_1StationaryObject_1_1Classification.html#ad497488a7119617633b54181ea08457d