feat(jest): create jest config package for unit testing (#3678)

* feat(jest): create jest config package for unit testing
* chore: housekeeping
* fix: now we need to explicitly allow importing without extension
* fix: recover EditorDriverInterface import
* Apply suggestions from code review
* chore: yarn

Signed-off-by: Sami Mazouz <sychocouldy@gmail.com>

js-packages/jest-config/package.json

@@ -0,0 +1,21 @@
+{
+    "name": "flarum-jest-config",
+    "version": "1.0.0",
+    "description": "Jest config for Flarum.",
+    "main": "index.cjs",
+    "author": "Flarum Team",
+    "license": "MIT",
+    "type": "module",
+    "prettier": "@flarum/prettier-config",
+    "dependencies": {
+        "@types/jest": "^29.2.2",
+        "flat": "^5.0.2",
+        "jest": "^29.3.1",
+        "jest-environment-jsdom": "^29.3.1",
+        "js-yaml": "^4.1.0",
+        "ts-jest": "^29.0.3"
+    },
+    "devDependencies": {
+        "prettier": "^2.4.1"
+    }
+}