Function quick_connect_vertex 

pub async fn quick_connect_vertex(
    access_token: &str,
    project: &str,
    location: &str,
    model: &str,
) -> Result<SessionHandle, SessionError>

Connect via Vertex AI with minimal configuration.

Uses sensible defaults: TransportConfig::default(), audio output modality. For advanced configuration, use SessionConfig::from_vertex() + connect() directly.