Support Collection types

[JackPGreen]

List_ types are explicitly supported in util.py, where:

• type_contains_serialized_data function returns whether the extracted type contains serialized data
• item_type function returns a transformed version of the extracted type
• is_var_sized_list function returns if it it's a list and not in FixSizedListTypes

Collection has no such support, and when a Collection_Something type is used, the following is logged:
Binary compatibility tests cannot be generated. Error: 'NoneType' object is not callable