feat(multi-entry): add plugin

packages/multi-entry/README.md

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+# Multi Entry Plugin 
+
+Support multiple entries instead of one client
+
+## Install
+
+```
+npm install -D @rambler-tech/razzle-multi-entry
+```
+
+or
+
+```
+yarn add -D @rambler-tech/razzle-multi-entry
+```
+
+## Usage
+
+Add the plugin to `razzle.config.js`
+
+```js
+const path = require('path')
+const MultiEntryPlugin = require('@rambler-tech/razzle-multi-entry')
+
+module.exports = {
+  plugins: [
+    MultiEntryPlugin({
+      mobile: path.resolve(__dirname, 'src/mobile/client'),
+      desktop: path.resolve(__dirname, 'src/desktop/client')
+    })
+  ],
+  modifyWebpackConfig({webpackConfig}) {
+    // ...
+    return webpackConfig
+  }
+}
+```

packages/multi-entry/index.js

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+module.exports = (entrypoints) => ({
+  modifyWebpackConfig({env: {target, dev: isDev}, webpackConfig}) {
+    const isServer = target === 'node'
+
+    if (!isServer) {
+      const clientKeys = Object.keys(entrypoints)
+
+      if (isDev) {
+        const rurl = webpackConfig.entry.client[0]
+
+        webpackConfig.entry = () => {
+          const entryObj = {}
+
+          clientKeys.forEach((key) => {
+            entryObj[key] = [rurl, entrypoints[key]]
+          })
+
+          return entryObj
+        }
+
+        webpackConfig.output.filename = 'static/js/[name].js'
+      } else {
+        webpackConfig.entry = {...entrypoints}
+      }
+    }
+
+    return webpackConfig
+  }
+})

packages/multi-entry/package.json

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+{
+  "name": "@rambler-tech/razzle-multi-entry",
+  "version": "0.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "sideEffects": false,
+  "publishConfig": {
+    "access": "public"
+  },
+  "peerDependencies": {
+    "razzle": ">=4",
+    "webpack": ">=5"
+  }
+}