Token subclass' for_user method is typed to return a Token

[Samuel-Therrien-Beslogic]

The example from the doc itself is a good minimal reproduction of this issue:

https://django-rest-framework-simplejwt.readthedocs.io/en/latest/creating_tokens_manually.html

from django.contrib.auth.models import AbstractBaseUser
from rest_framework_simplejwt.tokens import RefreshToken


def get_tokens_for_user(user: AbstractBaseUser):
    refresh = RefreshToken.for_user(user)

    return {
        "refresh": str(refresh),
        "access": str(refresh.access_token),  # "Token" has no attribute "access_token" Mypy [attr-defined]
    }

RefreshToken.for_user(user)'s return type, as seen by type-checkers (mypy/pyright) is Token instead of RefreshToken.

This is caused by BlacklistMixin.for_user being typed to return a Token, where I believe it should probably return Self (from typing_extensions import Self)

CC @theo-auffeuvre & @NicolasDontigny for visibility