Add fingerprint_inputs support (V3's IS_CHANGED)

comfy_extras/nodes_v3_test.py

@@ -1,4 +1,5 @@
 import torch
+import time
 from comfy_api.v3 import io, ui, resources
 import logging
 import folder_paths
@@ -176,6 +177,10 @@ class NInputsTest(io.ComfyNodeV3):
     def validate_inputs(cls, nmock, nmock2):
         return True
 
+    @classmethod
+    def fingerprint_inputs(cls, nmock, nmock2):
+        return time.time()
+
     @classmethod
     def check_lazy_status(cls, **kwargs) -> list[str]:
         need = [name for name in kwargs if kwargs[name] is None]