微信刚出的bind:chooseavatar事件用Rax如何写事件名？

用onChooseavatar写事件好像失效。

需要支持微信小程序 open-type 头像获取：https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/userProfile.html
支持chooseAvatar回调

Start by tracing Rax's WeChat mini-program event-name handling and compare it with the linked WeChat documentation for bind:chooseavatar. Done means the chooseAvatar callback is supported and an onChooseavatar-style handler works for the open-type avatar flow.

Written by the indexing model from the issue text.