fix: keep __api_exclude__ fields out of async request bodies

[shoutoutuoadi325]

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Changes being requested

Pass __api_exclude__ to model_dump in _async_transform_recursive, the same way _transform_recursive already does.

Models can declare client-only fields with __api_exclude__; right now ParsedResponseFunctionToolCall is the only one using it for parsed_arguments. The sync transform omits those fields when it dumps a model, the async one doesn't, so a request sent through AsyncOpenAI carries fields the API never sees from OpenAI.

The way you run into this is multi-turn structured output: with responses.parse you hand the parsed output items back in as input on the next turn. Done synchronously the function tool calls serialize to id/call_id/type/name/arguments; done with the async client, every function call in that list also ships a parsed_arguments key.

from openai._utils import transform, async_transform
from openai.types.responses import ResponseInputParam
from openai.types.responses.parsed_response import ParsedResponseFunctionToolCall

call = ParsedResponseFunctionToolCall(
    id="fc_1",
    call_id="call_1",
    type="function_call",
    name="get_weather",
    arguments='{"city": "Paris"}',
    parsed_arguments={"city": "Paris"},
)

transform([call], ResponseInputParam)
# [{'id': 'fc_1', 'call_id': 'call_1', 'type': 'function_call',
#   'name': 'get_weather', 'arguments': '{"city": "Paris"}'}]

# await async_transform([call], ResponseInputParam)
# same list, plus 'parsed_arguments': {'city': 'Paris'}

Additional context & links

Added test_pydantic_model_api_exclude to tests/test_transform.py covering the bare-model and list-of-models paths in both lanes, since __api_exclude__ had no direct test in either.

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