Add support for Ormar orm

[sorasful]

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Is your feature related to a problem? Please describe.

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Describe the solution you would like.

Hello !

First, thanks for this amazing package, this community really needs this.

I tried to use sqladmin with Ormar https://github.com/collerek/ormar/ which is basically another ORM built on top of SQLalchemy. And it seems that sqladmin has troubles with fields, even though under the hood it's SQLachemy, I think you have the same problem while implemtenting SQLModel.

So I figured out maybe if we implement for SQLmodel, we shouldn't be that far from being to implement another ORM.

Traceback (most recent call last):
  File "/.cache/pypoetry/virtualenvs/api-5UH-8tMH-py3.10/lib/python3.10/site-packages/sqladmin/models.py", line 57, in __new__
    mapper = inspect(model)
  File "ache/pypoetry/virtualenvs/-5UH-8tMH-py3.10/lib/python3.10/site-packages/sqlalchemy/inspection.py", line 71, in inspect
    raise exc.NoInspectionAvailable(
sqlalchemy.exc.NoInspectionAvailable: No inspection system is available for object of type <class 'ormar.models.metaclass.ModelMetaclass'>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/pegazor_api/__main__.py", line 95, in <module>
    class UserAdmin(ModelAdmin, model=User):
  File "/pypoetry/virtualenvs/i-5UH-8tMH-py3.10/lib/python3.10/site-packages/sqladmin/models.py", line 59, in __new__
    raise InvalidModelError(
sqladmin.exceptions.InvalidModelError: Class User is not a SQLAlchemy model.

Thank you :)

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[aminalaee]

Hey, thanks for the suggestion.

Well we can consider this in the future.
But the difference between SQLModel and ormar models is that SQLModel will be SQLALchemy models at the same time (at least to my understanding), so we don't have to do much to support them.
But let's keep this open for future references, maybe we could do it in a sane way 👍