opentelemetry-instrumentation-google-genai 0.4b0

• Implement the new semantic convention changes made in open-telemetry/semantic-conventions#2179. A single event (gen_ai.client.inference.operation.details) is used to capture Chat History. This is opt-in, an environment variable OTEL_SEMCONV_STABILITY_OPT_IN needs to be set to gen_ai_latest_experimental to see them (#3386)
• Support CompletionHook for upload to cloud storage.