Support lazy imports coming with Python 3.15 (`lazy` keyword)

[p-]

Hey CodeQL Team 👋

PEP 810 (Status: Accepted) introduced "Explicit lazy imports" for Python:

lazy import json
lazy from json import dumps

The lazy keyword is currently not supported and leads to processing errors when pre-releases of Python 3.15 are used.

[hugovk]

The other new syntax change coming to 3.15:

https://docs.python.org/3.15/whatsnew/3.15.html#whatsnew315-unpacking-in-comprehensions

(There's a month until feature freeze, so there may be more. Here's the release schedule.)

[hugovk]

And here's the CodeQL warning we get in the CPython repo:

[tausbn]

I have PRs up that will address both of these syntax changes:
#21694
#21695

The PEP-810 PR has been approved already, and will likely be merged soon. The second one is a bit more complicated, and will probably take a bit longer to get reviewed and merged.