Update extension category and config

Author: melloware

runtime/src/main/resources/META-INF/quarkus-extension.yaml

@@ -6,5 +6,7 @@ metadata:
     - "json"
     - "formatter"
   categories:
-    - "core"
+    - "logging"
+  config:
+    - "quarkus.log.json."
   status: "preview"