scoped cannot be used with yield (and probably async and lambdas) in implicit mode

[zhiltsov-max]

When @scoped is used in implicit mode, it does not make a visible variable in the function context, so when it is used with a generator or lambda, the context is not being captured. This leads to wrong behavior and Scope.current() access errors.

from datumaro.util.scope import scoped, on_exit_do
def bar(): pass

@scoped
def foo():
  on_exit_do(bar)
  yield from [1, 2, 3]

list(foo())

>>>
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in foo
  File "datumaro/datumaro/util/scope.py", line 149, in on_exit_do
    return Scope.current().on_exit_do(callback, *args,
AttributeError: 'NoneType' object has no attribute 'on_exit_do'