Return a tuple instead of ResolvedGlobalId

[shangxiao]

I think we can remove the need for a class to hold return values given that we now are dealing with Python and have the ability to unpack. I'm also not entirely sure why it was in the js lib as es6 has unpacking ("destructuring").

[syrusakbary]

You're right. Probably we can avoid this class ;)

[miracle2k]

I miss it.

from_global_id(foo).id is just more clear than from_global_id(foo)[1]

[miracle2k]

FWIW, was removed in ad6cb90