chore: scaffold ssr compiler

packages/compiler-ssr/README.md

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+# @vue/compiler-ssr

packages/compiler-ssr/api-extractor.json

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+{
+  "extends": "../../api-extractor.json",
+  "mainEntryPointFilePath": "./dist/packages/<unscopedPackageName>/src/index.d.ts",
+  "dtsRollup": {
+    "untrimmedFilePath": "./dist/<unscopedPackageName>.d.ts"
+  }
+}

packages/compiler-ssr/package.json

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+{
+  "name": "@vue/compiler-ssr",
+  "version": "3.0.0-alpha.2",
+  "description": "@vue/compiler-ssr",
+  "main": "dist/compiler-ssr.cjs.js",
+  "types": "dist/compiler-ssr.d.ts",
+  "files": [
+    "dist"
+  ],
+  "buildOptions": {
+    "prod": false,
+    "formats": [
+      "cjs"
+    ]
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/vuejs/vue.git"
+  },
+  "keywords": [
+    "vue"
+  ],
+  "author": "Evan You",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/vuejs/vue/issues"
+  },
+  "homepage": "https://github.com/vuejs/vue/tree/dev/packages/compiler-ssr#readme",
+  "dependencies": {
+    "@vue/compiler-core": "3.0.0-alpha.2"
+  }
+}

packages/compiler-ssr/src/index.ts

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+export function hello(): string {
+  return 'TODO'
+}