RestrictedEvalProvider too restrictive to be useable.

[kiranandcode]

Trying to decode:

def foo(x: list[int]) -> int:
     raise NotHandled

with RestrictedPythonEvalProvider fails with __getitem__ not defined, in particular RestrictedPython disables getitem in our current implementations which means that annotations don't work. This will probably lead many clients to not use RestrictedPython in favour of more unsafe and less restricted UnsafeEvalProvider.

[eb8680]

RestrictedEvalProvider is fully configurable to the same extent that RestrictedPython itself is, so this seems like a problem with whatever settings we are defaulting to that can be overridden in user code.

[kiranandcode]

Yes, that makes sense. I think we should adjust the defaults for RestrictedEvalProvider such that these basic annotations should work oob.