public ResponseStream<GenerateContentResponse> generateContentStream(Content content)
      throws IOException {
    return generateContentStream(Arrays.asList(content));
  }
Generates content with streaming support from generative model given a single Content.

@param content a {@link com.google.cloud.vertexai.api.Content} to send to the generative model.
    The role of the content is "user".
@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