`register_route_param_type` as decorator for Python Binds 🔥
```py
@register_route_param_type("user", r"\d+")
class User:
    def __init__(self, data: str):
        identifier = int(data)
        self.load_from_db()
    
    def load_from_db(self):
        ...


@app.get("/user/id{user}")
def get_user(user: User):
    ...
```