Add lazy import syntax

[evhub]

Should make lazy import name do a lazy import.

[evhub]

Since there's a PEP for this, let's just follow it exactly: https://peps.python.org/pep-0810/

[evhub]

This works well for lazy import module, but lazy from module import name is still buggy. For the latter, we should probably just detect when the name is referenced and then import it there rather than mocking it.