Feat add provide inject #1692
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Feat add provide inject #1692
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Feature
Mpx 输出 小程序 和 Web 支持 provide/inject 功能，支持选项式/组合式用法，具体使用和功能与 Vue2 对齐。
小程序：核心实现思路是，顶层 provide 挂载在全局 App scope，组件层 provide 挂载在所属页面 scope。由于小程序原生限制，无法获取真实渲染时的父组件引用关系，所以不能像 Vue 那样基于父组件 provide 原型继承来实现。
Web：提供 Vue2 原生 provide/inject API，顶层 createApp provde 在创建 Vue App 实例时注入。（packages/webpack-plugin/lib/runtime/optionProcessor.js）
TODO