Replace Proto graph format with Parquet

[miratepuffin]

• Restrict Map properties such that for each instance of the map in a history, each key has the same property type.
• Restrict List properties such that the values must be the same type.
• Remove Graph and PersistentGraph property types for the time being. remove Graph and PersistentGraph from Prop #1902
• Depricate the proto graph format and replace with a parquet format.