fix(types): Fixed Event | None runtime TypeError

[szokeasaurusrex]

Change Event's runtime value to typing.Any, since the previous value of None caused the expression Event | None to result in a TypeError at runtime, even when the Event | None expression was used as a type hint. Also, add a test to make sure we don't reintroduce this bug.

Fixes GH-2926

[antonpirker]

One question: Why are we not importing the types from _types no matter what TYPE_CHECKING is?

[szokeasaurusrex]

One question: Why are we not importing the types from _types no matter what TYPE_CHECKING is?

All the types are defined within an if TYPE_CHECKING block. So, the types only exist in TYPE_CHECKING environments. Attempting the import at runtime results in an ImportError:

>>> from sentry_sdk._types import Event
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'Event' from 'sentry_sdk._types' (/Users/dszoke/Development/SDK/sentry-python/sentry_sdk/_types.py)