希望加入表单组建read-only 模式

[fwd001]

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What problem does this feature solve?

表单级联数据详情回显，只用value disabled 回显非常不优雅，且样式不好自定义，后端查数据也不方便。

What does the proposed API look like?

所有表单组件加 只读回显模式，方便此类场景！

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