TypedStruct - improve support for list types

[koreno]

Can we support the following types?

class F(TypedStruct):
    a = [[typ]]
    b = (typ1, typ2, typ3)
    c = [(typ1, typ2, typ3)]

[idanarye]

For a - I think we'll just need to make the container style recursive.
For b - we'll need to add a new special field that handles tuples.
c is just going to work once we implement a and b.