feat: add react externals example#1

luhc228 merged 3 commits intoluhc228:feat/init-externals-loading-webpack-pluginluhc228/lynx-stack:feat/init-externals-loading-webpack-pluginfrom

upupming:feat/add-react-externals-exampleupupming/lynx-stack:feat/add-react-externals-exampleCopy head branch name to clipboard