Python 3.14 compatibility

[wRAR]

The annotations stuff is significantly revamped in Python 3.14, I wonder if andi breaks with it, and we should try to add support for it not much later than it releases.

[wRAR]

At least the existing tests work (#37)

[wRAR]

https://docs.python.org/3.14/howto/annotations.html

Also "typing-extensions provides a backport of get_annotations() that works on earlier versions of Python.", we may need to use that.