Retrieves the JSON object for the stats in the file named run_details.json in the project 
        specified by self.dx_project_id.
    
        Returns: 
            JSON object of the run details.

def get_run_details_json(self):
        """
        Retrieves the JSON object for the stats in the file named run_details.json in the project 
        specified by self.dx_project_id.
    
        Returns: 
            JSON object of the run details.
        """
        run_details_filename = "run_details.json"
        run_details_json_id = dxpy.find_one_data_object(more_ok=False,zero_ok=True,project=self.dx_project_id,name=run_details_filename)["id"]
        json_data = json.loads(dxpy.open_dxfile(dxid=run_details_json_id).read())
        #dxpy.download_dxfile(show_progress=True,dxid=run_details_json_id,project=self.dx_project_id,filename=output_name)
        return json_data