Can the `change` event of `inputNumber` reveal the value before the change

[Hilshire]

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What problem does this feature solve?

思考这样的场景：用户有24个点数可以分配给6个属性，当点数用完时就不可以再增加属性了。这时候也就不应该可以使用 InputNumber 的增加按钮改变数值了。可是此时用户依然可以减少属性，减少按钮应该依然有效。

这时候很容易想到使用 change 做处理，但是 change 没有暴露改变前的值，没有一个简单的方法知道用户到底增加了值还是减少了值

What does the proposed API look like?

当前的API如下：

Function(value: number | string)

参考 Element，在原有的基础上：

Function(value: number | string, oldValue: number | string)

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