chore: Jest config in TypeScript format (#2777)

Author: g-plane

package.json

@@ -46,6 +46,7 @@
     "sirv": "^1.0.10",
     "slash": "^3.0.0",
     "ts-jest": "^26.4.4",
+    "ts-node": "^9.1.1",
     "typescript": "^4.1.2",
     "vitepress": "^0.12.2",
     "yorkie": "^2.0.0"