message: fix: imports use type
diff: import { rest } from "../../rest/rest.ts";
  import { structures } from "../../structures/mod.ts";
  -import { Message } from "../../types/messages/message.ts";
  +import type { Message } from "../../types/messages/message.ts";
  import { endpoints } from "../../util/constants.ts";
  /** Returns a previousy-sent webhook message from the same token. Returns a message object on success. */
  