input没有清除功能

[xiangyue520]

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

What problem does this feature solve?

用户不需要自己去一点点清除,而是点击即可进行清除

What does the proposed API look like?

新增一个allowClear属性,默认开启,来完成清除功能

[sendya]

1.4.x 会提供，具体关注 feat-1.4 分支

[github-actions]

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