fix(shared): array.move without length change missing …

[charlzyx]

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修复 #4205 问题

What have you changed?

相比于原来的 splice 方案

array.splice(formIndex, 1); 
array.splice(toIndex, 0, formItem)

会引发的两次length变化, 缺少了这里的 reactions https://github.com/alibaba/formily/blob/v2.3.2/packages/reactive/src/reaction.ts#L140

我猜测这样导致了 array 的引用被认为是没有变化的, ArrayItems 里面的刷新逻辑跟之前有偏差;
这涉及到 react 经典的 为什么尽量不使用数组的 index 做key 与 formliy 响应式模型的一点点冲突;

TODO: 后续我会在深入研究之后在这个pr之后进行补充