replace YiTokenizer to LlamaTokenizer to support load tokenizer without trsut_remote_code

tokenizer_config.json

@@ -1,9 +1,9 @@
 {
   "auto_map": {
-    "AutoTokenizer": ["tokenization_yi.YiTokenizer", null]
+    "AutoTokenizer": ["LlamaTokenizer"]
   },
   "add_bos_token": false,
   "add_eos_token": false,
   "model_max_length": 4096,
-  "tokenizer_class": "YiTokenizer"
+  "tokenizer_class": "LlamaTokenizer" 
 }