core: Put Python version as a project requirement so it is considered by ruff

[cbornet]

Ruff doesn't know about the python version in [tool.poetry.dependencies]. It can get it from project.requires-python.

Notes:

• poetry seems to have issues getting the python constraints from requires-python and using python in per dependency constraints. So I had to duplicate the info. I will open an issue on poetry.
• inspect.isclass() doesn't work correctly with GenericAlias (list[...], dict[..., ...]) on Python <3.11 so I added some not isinstance(type, GenericAlias) checks:

Python 3.11

>>> import inspect
>>> inspect.isclass(list)
True
>>> inspect.isclass(list[str])
False

Python 3.9

>>> import inspect
>>> inspect.isclass(list)
True
>>> inspect.isclass(list[str])
True

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Name	Status	Preview	Comments	Updated (UTC)
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[efriis]

reverting the pyproject change because core isn't installable by uv anymore as a result

I think if we completely switch metadata over to project from tool.poetry that will help, but docs build currently can't run

I think extended tests pass because none of the uv install steps actually install core - they just affect envs that have core already installed from poetry