[fix] logger add debug_once (#781)

## Purpose
add `debug_once` interface to be compatible with vllm 0.11.0

## Modifications 
- add `debug_once` interface to logger
- stub the interface with `scope` keyword 

## Test
<img width="1345" height="475" alt="image"
src="https://github.com/user-attachments/assets/a999ea0c-2adb-4187-9eb2-58c7f81ed7c2"
/>

Co-authored-by: lijiachen <lijiachen19@huawei.com>

Author: Lijiachen1018

ucm/logger.py

@@ -106,7 +106,7 @@ def format_log_msg(msg, *args) -> str:
             return msg % args
         return msg
 
-    def log(self, levelno, message, *args, exc_info=None):
+    def log(self, levelno, message, *args, exc_info=None, scope=None):
         level = LevelMap[levelno]
         frame = inspect.currentframe()
         caller_frame = frame.f_back.f_back
@@ -142,6 +142,10 @@ def info_once(self, message: str, *args: Hashable, **kwargs: Hashable):
     def warning_once(self, message: str, *args: Hashable, **kwargs: Hashable):
         self.log(logging.WARNING, message, *args, **kwargs)
 
+    @lru_cache
+    def debug_once(self, message: str, *args: Hashable, **kwargs: Hashable):
+        self.log(logging.DEBUG, message, *args, **kwargs)
+
 
 def init_logger(name: str = "UC") -> Logger:
     return Logger(name)