implement reference grpc server

contrib/schema.json

@@ -2,10 +2,16 @@
   "definitions": {
     "ConfigDemoOpts": {
       "properties": {
-        "optField": {
-          "type": "integer"
+        "factLang": {
+          "default": "en",
+          "type": "string"
         },
-        "optName": {
+        "factType": {
+          "default": "random",
+          "enum": [
+            "today",
+            "random"
+          ],
           "type": "string"
         }
       },
@@ -104,12 +110,6 @@
     }
   },
   "properties": {
-    "demoField": {
-      "type": "integer"
-    },
-    "demoType": {
-      "$ref": "#/definitions/ConfigDemoOpts"
-    },
     "environment": {
       "type": "string"
     },
@@ -125,9 +125,16 @@
     "name": {
       "type": "string"
     },
+    "opts": {
+      "$ref": "#/definitions/ConfigDemoOpts"
+    },
     "otel": {
       "$ref": "#/definitions/ConfigOTELConfig"
     },
+    "timezone": {
+      "default": "UTC",
+      "type": "string"
+    },
     "version": {
       "type": "string"
     }