a-input-password 组件无法使用foucs方法

[git-leonzhou]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

能够解决在输入错误验证后，快速聚焦，让用户能够快速二次录入

What does the proposed API look like?

希望能如 a-input 组件那样，通过refs使用focus方法；
e.g：this.$refs.username.focus();

[github-actions]

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