app: Add support for user-created attributes

Note: This PR doesn't handle errors around Jpeg files very well.

Co-authored-by: Bojidar Marinov <bojidar.marinov.bg@gmail.com>
Co-authored-by: Austin Alvarado <pixelrazor@gmail.com>

app/queries/get_user_attributes_schema.graphql

@@ -8,6 +8,7 @@ query GetUserAttributesSchema {
         isVisible
         isEditable
         isHardcoded
+        isReadonly
       }
     }
   }

app/queries/get_user_details.graphql

@@ -2,15 +2,30 @@ query GetUserDetails($id: String!) {
   user(userId: $id) {
     id
     email
-    displayName
-    firstName
-    lastName
     avatar
+    displayName
     creationDate
     uuid
     groups {
       id
       displayName
     }
+    attributes {
+      name
+      value
+    }
+  }
+  schema {
+    userSchema {
+      attributes {
+        name
+        attributeType
+        isList
+        isVisible
+        isEditable
+        isHardcoded
+        isReadonly
+      }
+    }
   }
 }