feat: add registry configuration file to catalog (SchemaStore#4610)

Typical filename is `registry.yaml`, which feels a bit generic.

https://aquaproj.github.io/docs/reference/registry-config/

Author: scop

src/api/json/catalog.json

@@ -252,6 +252,12 @@
       "fileMatch": [".aqua-policy.yaml", "aqua-policy.yaml"],
       "url": "https://raw.githubusercontent.com/aquaproj/aqua/main/json-schema/policy.json"
     },
+    {
+      "name": "registry.yaml",
+      "description": "aqua registry configuration file",
+      "fileMatch": [],
+      "url": "https://raw.githubusercontent.com/aquaproj/aqua/main/json-schema/registry.json"
+    },
     {
       "name": "arb.json",
       "description": "Application Resource Bundle",