public ResponseStream<GenerateContentResponse> generateContentStream(String text)
      throws IOException {
    return generateContentStream(ContentMaker.fromString(text));
  }
Generates content with streaming support from generative model given a text.

@param text a text message to send to the generative model
@return a {@link ResponseStream} that contains a streaming of {@link
    com.google.cloud.vertexai.api.GenerateContentResponse}
@throws IOException if an I/O error occurs while making the API call
java-vertexai/google-cloud-vertexai/src/main/java/com/google/cloud/vertexai/generativeai/GenerativeModel.java