希望table的currentDatasource可以实时获取

[arika163]

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

What problem does this feature solve?

目前的currentDatasource只能通过change事件获取，但是如果替换表格元数据，change事件并不会触发，对于需要实时刷新数据的表格，我们无法将currentDatasource作为一些实时计算的依据

What does the proposed API look like?

一个名为currentDatasource的API，通过.sync语法糖来实现数据绑定，初始化的时候向父组件update一次，随后每次变化都触发update

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[github-actions]

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