QuartSQLAlchemy constructor does not support Quart factory pattern

[brassy-endomorph]

I want to do the following:

# __init__.py
from quart import Quart
from quart_sqlalchemy import QuartSQLAlchemyConfig

def create_app() -> Quart:
    quart = Quart(__name__)
    ...  # init stuff
    db.config = QuartSQLAlchemyConfig(...)
    db.init_app(app)

# db.py
from quart_squalchemy import QuartSQLAlchemy

db = QuartSQLAlchemy()

This fails because the QuartSQLAlchemy constructor calls its superclass which calls initialize().

quart-sqlalchemy/src/quart_sqlalchemy/framework/extension.py

Lines 11 to 19 in d08114d

	class QuartSQLAlchemy(SQLAlchemy):
	def __init__(
	self,
	config: SQLAlchemyConfig,
	app: t.Optional[Quart] = None,
	):
	super().__init__(config)
	if app is not None:
	self.init_app(app)

quart-sqlalchemy/src/quart_sqlalchemy/sqla.py

Lines 22 to 31 in d08114d

	class SQLAlchemy:
	config: SQLAlchemyConfig
	binds: t.Dict[str, t.Union[Bind, AsyncBind]]
	Model: t.Type[sa.orm.DeclarativeBase]
	def __init__(self, config: SQLAlchemyConfig, initialize: bool = True):
	self.config = config
	if initialize:
	self.initialize()

A fix for this would be for QuartSQLAlchemy to init like:

    def __init__(
        self,
        config: SQLAlchemyConfig,
        app: t.Optional[Quart] = None,
    ):
        super().__init__(config, initialize=app is not None)
        if app is not None:
            self.init_app(app)

And then for init_app() to call self.initialize() as its first line.