Add new UDM2 and related asset types

[ericrdunham]

This pull request does 4 things:

• Changes usage of the deprecated .isAlive from the threading library to .is_alive
• Adds all item and asset types from the current staging environment to the supported default list, to prevent/limit calls to get_remote_choices
• Makes the default timeout for _get_json_or_raise go to 11, as 0.7 was too short of a time to do an authenticated round-trip to the server and was triggering unhelpful user errors when attempting to query for non-local asset or item types
• Mocks out calls in tests/test_types.py that would raise a 401 error when attempting to get remote item types or asset types, as these endpoints now require authentication

[sarasafavi]

thanks @ericrdunham !