Read the ifcJSON model from the Database

This is very simple:

• Get the objects from the object table ifcjson field
• Get the representations from the representation table ifcjson field
• Get the propertySets from the propertyset table ifcjson field
• Get the relationships from the relationship table ifcjson field

Get the header from the bundle table or create a new one.

Load all in an ifcJSON and store it. Done!