refactor: remove deprecated parameter and function/cleanup code (#101)

* refactor: remove deprecated parameter and function

* refactor: centralize type aliases in types.py and simplify crud layer

* test: add missing tests for fixtures/utils.py

* refactor: simplify and deduplicate across crud, metrics, cli, and
exceptions

* docs: fix old Paginate references

* docs: add migration + fix icon

* docs: update README/migration to v2

src/fastapi_toolsets/dependencies.py

@@ -1,20 +1,17 @@
 """Dependency factories for FastAPI routes."""
 
 import inspect
-from collections.abc import AsyncGenerator, Callable
-from typing import Any, TypeVar, cast
+from collections.abc import Callable
+from typing import Any, cast
 
 from fastapi import Depends
 from sqlalchemy.ext.asyncio import AsyncSession
-from sqlalchemy.orm import DeclarativeBase
 
 from .crud import CrudFactory
+from .types import ModelType, SessionDependency
 
 __all__ = ["BodyDependency", "PathDependency"]
 
-ModelType = TypeVar("ModelType", bound=DeclarativeBase)
-SessionDependency = Callable[[], AsyncGenerator[AsyncSession, None]]
-
 
 def PathDependency(
     model: type[ModelType],