Use Initializer for Microsoft and Google Buildings

Currently, the initializer is only working for the OSM buildings stemming from the OSM replication database. To implement the initializer for the Microsoft and Google buildings, some changes need to be made:

• Separate retrieval of building information from additional information from the building context ( #11 (closed))
• Seperate the CLI function from the BuildingInitializer class python file, to in the future be able to work with other classes that may be in different files ( #13 (closed))
• Create a OSMBuildingInitializer geared towards OSM buildings. These are a special case compared to any other building database, as they can be found in the OSM Replication database, where not only the building information, but also the information of about the building context is found. Therefore some optimization in queries can be made for the OSM buildings that are not possible for other building datasets ( #14 (closed))
• Implement the get_building_information and get_additional_information functions for other building datasets ( #15 (closed))