input输入框能不能加一个输入长度监控功能，就是ELementUI的input的show-word-limit属性

[LiuYnag]

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

What problem does this feature solve?

希望在input上添加实时显示输入数据长度功能

What does the proposed API look like?

功能与ElementUI的input的属性show-word-limit是一样的

[Ifover]

这都1年过去了 还没加么

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[github-actions]

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