feat(config/nacos): 变更回调增加变更前的配置对象，可以用来判断哪些配置变更进行特殊处理 #4331
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这个没啥必要，我之前加这个onchange回调的时候考虑过这个，按照gf的设计来说，每个组件都是解耦的，如果有需要组件应该自己缓存自己需要的旧配置内容，配置更新了onchange里带着新配置通知下就行，剩下的让具体组件自己决定要干嘛，目前V3 plan下面大家也提出了增强感知需求，就是不知道会不会通过 |
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变更回调增加变更前的配置对象，可以用来判断哪些配置变更进行特殊处理。目前是只能获取更新后的配置，无法获取之前的配置，有些特殊配置无法感知是否变更。