Add Rules Unit Testing v2 skeleton for v9 release (#5352)

* Reset package for next major version.

* Switch emulator script to node-fetch.

* Migrate the other request call to fetch.

* Update packages/rules-unit-testing/package.json

Co-authored-by: Feiyang <feiyangc@google.com>

* Create stale-ducks-live.md

* Revert version change.

Co-authored-by: Feiyang <feiyangc@google.com>

.changeset/stale-ducks-live.md

@@ -0,0 +1,5 @@
+---
+"@firebase/rules-unit-testing": major
+---
+
+BREAKING: Implement Rules Unit Testing v2 with new design and APIs.

packages/rules-unit-testing/index.ts

@@ -1,6 +1,6 @@
 /**
  * @license
- * Copyright 2017 Google LLC
+ * Copyright 2021 Google LLC
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,19 +21,4 @@
  * creating a dependency on @firebase/rules-unit-testing.
  */
 
-export {
-  apps,
-  assertFails,
-  assertSucceeds,
-  discoverEmulators,
-  clearFirestoreData,
-  database,
-  firestore,
-  initializeAdminApp,
-  initializeTestApp,
-  loadDatabaseRules,
-  loadFirestoreRules,
-  loadStorageRules,
-  useEmulators,
-  withFunctionTriggersDisabled
-} from './src/api';
+export const TODO = 'TODO';

packages/rules-unit-testing/package.json

@@ -5,7 +5,7 @@
   "author": "Firebase <firebase-support@google.com> (https://firebase.google.com/)",
   "main": "dist/index.cjs.js",
   "engines": {
-    "node": "^8.13.0 || >=10.10.0"
+    "node": ">=10.10.0"
   },
   "files": [
     "dist"
@@ -19,25 +19,12 @@
     "test:ci": "node ../../scripts/run_tests_in_ci.js -s test"
   },
   "license": "Apache-2.0",
-  "dependencies": {
-    "firebase": "8.10.0",
-    "@firebase/component": "0.5.6",
-    "@firebase/logger": "0.2.6",
-    "@firebase/util": "1.3.0",
-    "request": "2.88.2"
-  },
   "devDependencies": {
-    "@google-cloud/firestore": "4.12.3",
-    "@types/request": "2.48.5",
-    "firebase-admin": "9.9.0",
-    "firebase-tools": "9.14.0",
-    "firebase-functions": "3.14.1",
     "rollup": "2.52.2",
     "rollup-plugin-typescript2": "0.30.0"
   },
   "peerDependencies": {
-    "@google-cloud/firestore": "^4.2.0",
-    "firebase-admin": "^9.7.0"
+    "firebase": "^8.10.0"
   },
   "repository": {
     "directory": "packages/rules-unit-testing",