🚨 Fix Type of "Field" is partially unknown with Pyright in strict mode

[mpyuglgwkxcmodyrpo]

See #1598 for discussion. I wanted to see if this would pass tests across the matrix (don't see why they wouldn't).
I think this only applies to pyright in strict mode.

I can't edit lables, so someone should add the bug label or whatever else is relevant.

[mpyuglgwkxcmodyrpo]

This is a more suitable alternative to #1604 as it keeps the from __future__ import annotations line a the top of main.py, thus keeping python 3.9 support.

[YuriiMotov]

This fixes the issue and solution looks good to me.

To reproduce the issue, create main.py with:

# pyright: strict
from sqlmodel import Field

And run:

pip install pyright
pyright main.py

@mpyuglgwkxcmodyrpo, thanks!

[youhogeon-meritz]

That's awesome!

I hope the version with these changes gets released soon.