Add custom metadata fields

Author: BNAndras

exercises/practice/square-root/.meta/config.json

@@ -14,6 +14,14 @@
     ]
   },
   "blurb": "Given a natural radicand, return its square root.",
+  "custom": {
+    "version.tests.compatibility": "jest-29",
+    "flag.tests.task-per-describe": false,
+    "flag.tests.may-run-long": false,
+    "flag.tests.includes-optional": false,
+    "flag.tests.jest": true,
+    "flag.tests.tstyche": false
+  },
   "source": "wolf99",
   "source_url": "https://github.com/exercism/problem-specifications/pull/1582"
 }