fix: allow union typing for supported bindings

todo: support built-in collection types (list) after Bill's PR is merged

Python 3.10 and above allow for ABCMeta | _GenericAlias type hinting syntax. (For example: event: func.EventHubEvent | List[func.EventHubEvent])

For bindings that allow List[<type>] type hints, this allows for the new syntax.

This is accomplished by:

Adding a new method as part of the type checking process
The new method will parse the individual types in the Union and determine if all of the types are supported
If any of the types in the Union aren't supported, indexing will fail
As this new method is part of an or statement in type checking, it won't affect any currently supported type hints

Bindings that can now support this syntax:

Azure / azure-functions-python-library