Can not set connection and total timeout for aiohttp streaming requests

[Harry-Kwon]

This is a client library issue where setting the "timeout" option in genai.Client's http_options raises an error, making it impossible to set both the toal and connection timeout using aiohttp.

Environment details

• Programming language: Python
• OS: Linux (affects all OSes)
• Language runtime version: Python 3.12
• Package version: 1.51.0

Steps to reproduce

1. Make a streaming request with the following client options:

client = genai.Client(
    ...,
    http_options=types.HttpOptions(
        async_client_args={
            "timeout": aiohttp.ClientTimeout(
                total=600.0,
                connect=10.0,
            )
        }
    ),
)

2. This raises an error

TypeError: aiohttp.client.ClientSession.request() got multiple values for keyword argument 'timeout'

This is due to the timeout field being hardcoded in the aiohttp_session request

python-genai/google/genai/_api_client.py

Line 1257 in a4f4205

timeout=aiohttp.ClientTimeout(total=http_request.timeout),

while also being unpacked in

python-genai/google/genai/_api_client.py

Line 1258 in a4f4205

**self._async_client_session_request_args,