feat(security): add guest user attributes and get_guest_user_attribute() macro (#33924)

Co-authored-by: Yash Janoria <yash.janoria@314ecorp.com>
Co-authored-by: Evan <evan@preset.io>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Evan Rusackas <evan@rusackas.com>

docs/static/resources/openapi.json

@@ -11383,6 +11383,13 @@
       },
       "User3": {
         "properties": {
+          "attributes": {
+            "additionalProperties": {
+              "nullable": true
+            },
+            "nullable": true,
+            "type": "object"
+          },
           "first_name": {
             "type": "string"
           },