[stop sequence] support stop sequence (#3025)

* stop seqs in multi-ends

* unittest for gpu stop op

* kernel tid==0

fastdeploy/config.py

@@ -101,9 +101,6 @@ class ModelConfig:
         self,
         args,
     ):
-        self.max_stop_seqs_num = 5
-        self.stop_seqs_max_len = 8
-
         # NOTE(gongshaotain): form _load_model_init_val()
         self.top_p = 1.0
         self.temperature = 1.0
@@ -122,6 +119,9 @@ class ModelConfig:
         self.enable_redundant_experts = False
         self.redundant_experts_num = 0
 
+        self.max_stop_seqs_num = int(envs.FD_MAX_STOP_SEQS_NUM)
+        self.stop_seqs_max_len = int(envs.FD_STOP_SEQS_MAX_LEN)
+
         for key, value in args.items():
             if hasattr(self, key):
                 setattr(self, key, value)