Address an issue with pydantic v2 models as Vars

[kroo]

It looks like there's an issue with state vars which are pydantic v2 models... Here's a reproducible test case:

import reflex as rx
from pydantic import BaseModel
from reflex.utils.serializers import serializer

class User(BaseModel):
    has_image: bool = False

@serializer
def serialize_user(user: User) -> dict:
    return user.dict()

class State(rx.State):
    user: User = None

def index() -> rx.Component:
    return rx.container(
        rx.cond(State.user,
                rx.text(State.user.has_image),
                rx.text("No user"))
    )

app = rx.App()
app.add_page(index)

This app works only with pydantic <2 installed:

reflex-test $ reflex run
...
AttributeError: 'FieldInfo' object has no attribute 'outer_type_'
reflex-test $ pip install pydantic==1.10.15
─────────────────────────────────── Starting Reflex App ───────────────────────────────────
Compiling: ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 13/13 0:00:00
─────────────────────────────────────── App Running ───────────────────────────────────────
App running at: http://localhost:3000

Looks like this is caused by outer_type_ no longer existing in pydantic v2. I'm guessing this was introduced back in v0.4.6.

This change explicitly ignores pydantic v2 models in get_attribute_access_type, rather than trying to treat them as v1 models.

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