Added `shared_views` default setting

no issue

- we want custom views to be shared for all users and managed by admins rather than per-user

core/server/data/schema/default-settings.json

@@ -175,6 +175,9 @@
                     "max": 300
                 }
             }
+        },
+        "shared_views": {
+            "defaultValue": "{}"
         }
     },
     "theme": {