interface MessageDeltaimport { type MessageDelta } from "https://deno.land/x/openai@v4.56.0/resources/beta/threads/messages.ts"; The delta containing the fields that have changed on the Message. Propertiesoptionalcontent: Array<MessageContentDelta>The content of the message in array of text and/or images. optionalrole: "user" | "assistant"The entity that produced the message. One of user or assistant.