chore: 编译到小程序插件，解决挂载全局方法防止冲突

packages/vue-cli-plugin-uni/lib/mp/index.js

@@ -171,7 +171,7 @@ module.exports = {
     if (process.env.UNI_MP_PLUGIN) {
       // 小程序插件入口使用
       // packages\webpack-uni-mp-loader\lib\plugin\index-new.js -> addMPPluginRequire
-      beforeCode += 'wx.__webpack_require__ = __webpack_require__;'
+      beforeCode += `wx.__webpack_require_${process.env.UNI_MP_PLUGIN.replace('-', '_')}__ = __webpack_require__;`
 
       const UNI_MP_PLUGIN_MAIN = process.env.UNI_MP_PLUGIN_MAIN
       if (UNI_MP_PLUGIN_MAIN) {

packages/webpack-uni-mp-loader/lib/plugin/index-new.js

@@ -80,7 +80,7 @@ function addMPPluginRequire (compilation) {
         const newlineIndex = compilation.assets[name].source().lastIndexOf('\n')
 
         const source = compilation.assets[name].source().substring(0, newlineIndex) +
-        `\nmodule.exports = wx.__webpack_require__(${uniModuleId});\n` +
+        `\nmodule.exports = wx.__webpack_require_${process.env.UNI_MP_PLUGIN.replace('-', '_')}__(${uniModuleId});\n` +
         compilation.assets[name].source().substring(newlineIndex + 1)
 
         compilation.assets[name] = {