feat/add watch build mode

[yangxiaolang]

watch build 用于 AUI 的类库调试，方便直接在引入 AUI 的项目中对 AUI 直接进行开发调试，AUI 的改动能实时更新到引入项目。

除了通过yarn link软链接的方式，也支持构建产物直接拷贝到目标项目

直接在 build:watch 命令后加上调试项目的路径即可，会自动检测 node_modules 目录，copy release 到目标项目node_modules 的 @alauda/ui( aui的package-name决定 ) ， 目标路径下没有node_modules会报错

这种做法相比yarn link软链接的好处是，相当于直接在目标项目处建了备份，目标项目的angular.json或NODE_OPTIONS不需要设置preserveSymlinks
坏处就是每次watch build完都会把release完整拷贝到目标项目处一份

[changeset-bot]

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Latest commit: 859b718

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[fengtianze]

readme加个文档