Native model and generic ID (#971)

* Use a generic Protocol model for User instead of Pydantic

* Remove UserDB Pydantic schema

* Harmonize schema variable naming to avoid confusions

* Revamp OAuth account model management

* Revamp AccessToken DB strategy to adopt generic model approach

* Make ID a generic instead of forcing UUIDs

* Improve generic typing

* Improve Strategy typing

* Tweak base DB typing

* Don't set Pydantic schemas on FastAPIUsers class: pass it directly on router creation

* Add IntegerIdMixin and export related classes

* Start to revamp doc for V10

* Revamp OAuth documentation

* Fix code highlights

* Write the 9.x.x ➡️ 10.x.x migration doc

* Fix pyproject.toml

docs/src/db_beanie_oauth.py

@@ -0,0 +1,24 @@
+from typing import List
+
+import motor.motor_asyncio
+from beanie import PydanticObjectId
+from fastapi_users.db import BaseOAuthAccount, BeanieBaseUser, BeanieUserDatabase
+from pydantic import Field
+
+DATABASE_URL = "mongodb://localhost:27017"
+client = motor.motor_asyncio.AsyncIOMotorClient(
+    DATABASE_URL, uuidRepresentation="standard"
+)
+db = client["database_name"]
+
+
+class OAuthAccount(BaseOAuthAccount):
+    pass
+
+
+class User(BeanieBaseUser[PydanticObjectId]):
+    oauth_accounts: List[OAuthAccount] = Field(default_factory=list)
+
+
+async def get_user_db():
+    yield BeanieUserDatabase(User)