[Feature] Support mixed deployment with adapter (#3517)

fastdeploy/scheduler/local_scheduler.py

@@ -208,6 +208,9 @@ class LocalScheduler:
         """
         return (token_num + block_size - 1) // block_size
 
+    def get_unhandled_request_num(self):
+        return len(self.requests)
+
     def get_requests(
         self,
         available_blocks,