Tool calls and responses not recorded in message events in opentelemetry-instrumentation-google-genai

AFAICT this is not addressed by https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3446, which adds spans to the tool calls themselves. The events as described in https://opentelemetry.io/docs/specs/semconv/gen-ai/gen-ai-events/ are missing gen_ai.tool.message and the tool_calls part of the gen_ai.assistant.message event body.

For example, in https://github.com/pydantic/logfire/blob/94e0a605b6c65342650fd2c8bd5f587c3c3399d8/tests/otel_integrations/test_google_genai.py I have:

from google.genai import Client, types

client = Client()


def get_current_weather(location: str) -> str:
    """Returns the current weather.

    Args:
      location: The city and state, e.g. San Francisco, CA
    """
    return 'rainy'


response = client.models.generate_content(  # type: ignore
    model='gemini-2.0-flash-001',
    contents='What is the weather like in Boston?',
    config=types.GenerateContentConfig(
        tools=[get_current_weather],
    ),
)

and it just produces events data like this:

                        {'content': 'What is the weather like in Boston?', 'role': 'user'},
                        {
                            'index': 0,
                            'finish_reason': 'STOP',
                            'message': {'role': 'assistant', 'content': ['It is rainy in Boston, MA.\n']},
                        },

It's calling the tools, but not showing it.

Start by reproducing the Google GenAI example in tests/otel_integrations/test_google_genai.py and compare its emitted events with the GenAI events specification. Trace the google-genai instrumentation's message-event handling, then verify that tool calls produce gen_ai.tool.message and that assistant events include tool_calls.