rename comfy/logging.py to comfy/internal_logging.py (#15231)

This avoids name collision (circular imports) for external custom nodes,
for which the comfy path is pushed into sys.path so Python's own logging module
is shadowed otherwise.

fixes: #15229

comfy/internal_logging.py

@@ -0,0 +1,10 @@
+import logging
+
+
+DETAIL = 15
+logging.addLevelName(DETAIL, "DETAIL")
+
+
+def detail(message, *args, **kwargs):
+    kwargs.setdefault("stacklevel", 2)
+    logging.log(DETAIL, message, *args, **kwargs)