prs-fleshgolem-2070: feat: sqlalchemy 2.0 (#2096)

* upgrade sqlalchemy to 2.0

* rewrite all db models to sqla 2.0 mapping api

* fix some importing and typing weirdness

* fix types of a lot of nullable columns

* remove get_ref methods

* fix issues found by tests

* rewrite all queries in repository_recipe to 2.0 style

* rewrite all repository queries to 2.0 api

* rewrite all remaining queries to 2.0 api

* remove now-unneeded __allow_unmapped__ flag

* remove and fix some unneeded cases of "# type: ignore"

* fix formatting

* bump black version

* run black

* can this please be the last one. okay. just. okay.

* fix repository errors

* remove return

* drop open API validator

---------

Co-authored-by: Sören Busch <fleshgolem@gmx.net>

tests/unit_tests/schema_tests/test_mealie_model.py

@@ -25,7 +25,6 @@ def test_camelize_variables():
 
 
 def test_cast_to():
-
     model = TestModel(long_name="Hello", long_int=1, long_float=1.1)
 
     model2 = model.cast(TestModel2, another_str="World")
@@ -37,7 +36,6 @@ def test_cast_to():
 
 
 def test_map_to():
-
     model = TestModel(long_name="Model1", long_int=100, long_float=1.5)
 
     model2 = TestModel2(long_name="Model2", long_int=1, long_float=1.1, another_str="World")