add model_dump options to sqlmodel_update

[A00474880]

As per discussion #1838, this PR allows users to use model_dump parameters directly in sqlmodel_update function.

New Usage Pattern

Previous recommend use of sqlmodel_update is as follows:

def update_hero(
    *, session: Session = Depends(get_session), hero_id: int, hero: HeroUpdate
):
    db_hero = session.get(Hero, hero_id)
    ...
    hero_data = hero.model_dump(exclude_unset=True)
    db_hero.sqlmodel_update(hero_data)
    ...

This PR allows the following while keeping backward compatibility with the above:

def update_hero(
    *, session: Session = Depends(get_session), hero_id: int, hero: HeroUpdate
):
    db_hero = session.get(Hero, hero_id)
    ...
    db_hero.sqlmodel_update(hero, exclude_unset=True)
    ...

Tests

This PR also adds assertions in the test_update function that increases test coverage by 2 lines:
before:

Name                                                                                                        Stmts   Miss  Cover   Missing
-----------------------------------------------------------------------------------------------------------------------------------------
sqlmodel/main.py                                                                                              375     16    96%   593, 645, 666, 673, 675, 690, 712, 715, 721, 723, 725, 727, 729, 908, 996, 1004

after:

Name                                                                                                        Stmts   Miss  Cover   Missing
-----------------------------------------------------------------------------------------------------------------------------------------
sqlmodel/main.py                                                                                              368     14    96%   593, 645, 666, 673, 675, 690, 712, 715, 721, 723, 725, 727, 729, 908

[A00474880]

I can't seem to be able to add labels to this PR. So it'd be great if I can get this reviewed

[YuriiMotov]

@A00474880, thanks for your interest and efforts!

I pointed to a couple of issues with this implementation

[YuriiMotov]

kwargs will not give autocompletion, and it's error-prone

[YuriiMotov]

This will break use cases with models that have fields with exclude=True:

from sqlmodel import Field, SQLModel


class Item(SQLModel):
    id: str
    param: str = Field(exclude=True)


a = Item.model_validate({"id": "1", "param": "1"})
b = Item.model_validate({"id": "1", "param": "2"})


a.sqlmodel_update(b, exclude={"id"})
# a.sqlmodel_update(b)


assert a.param == "2"

.. and probably some other cases when model has settings that change the default serialization schema.