TypeAdapter is not a class according to inspect.isclass #8267

Initial Checks

Description

Currently, a TypeAdapter from Pydantic v2 does not satisfy inspect.isclass .

Something in these innards lead to an inability to compose TypeAdapter into pydantic models.

from typing import TypeVar, Generic, Type
from pydantic import BaseModel
T = TypeVar("T", bound=BaseModel)
class Consumer(BaseModel, Generic[T]):
    pydantic_model: Type[T]  # One cannot set this to be a TypeAdapter 

Example Code

import inspect
from pydantic import BaseModel, TypeAdapter
class Item(BaseModel):
    attr: int
Items = TypeAdapter(list[Item])
assert inspect.isclass(Items), f"Items is not a class."

Python, Pydantic & OS Version

pydantic version: 2.4.2
        pydantic-core version: 2.10.1
          pydantic-core build: profile=release pgo=false
                 install path: /Users/user/code/repo/venv/lib/python3.11/site-packages/pydantic
               python version: 3.11.5 (main, Sep 12 2023, 09:45:47) [Clang 14.0.0 (clang-1400.0.29.202)]
                     platform: macOS-13.5.2-arm64-arm-64bit
             related packages: typing_extensions-4.8.0 mypy-1.7.1 pydantic-settings-2.1.0 fastapi-0.104.1