Function saveTextMessageDraft

saveTextMessageDraft(
options: IConversationIdentifier,
draft: string,
): Promise<RCResult<void>>
设置会话文本草稿
Parameters
- options: IConversationIdentifier
  会话信息
- draft: string
  草稿内容
Returns Promise<RCResult<void>>
Description
Web 端草稿为内存态保存，如刷新浏览器会导致已经设置的草稿丢失
Example
设置会话文本草稿示例：
```
const options = {
 conversationType: RongIMLib.ConversationType.PRIVATE,
 targetId: 'targetId',
}
const draft = '这是草稿信息';
const conversation = await RongIMLib.saveTextMessageDraft(options, draft);
console.info('设置会话文本草稿结果：', conversation);
```