Add tiny processor fixture for testing

config.json

@@ -5,7 +5,7 @@
   "ignore_index": -100,
   "image_token_index": 32000,
   "model_type": "llava",
-  "pad_token_id": 32001,
+  "pad_token_id": 502,
   "projector_hidden_act": "gelu",
   "text_config": {
     "_name_or_path": "lmsys/vicuna-7b-v1.5",

tokenizer.json

@@ -31,7 +31,7 @@
       "special": true
     },
     {
-      "id": 32000,
+      "id": 501,
       "content": "<image>",
       "single_word": false,
       "lstrip": false,
@@ -40,7 +40,7 @@
       "special": true
     },
     {
-      "id": 32001,
+      "id": 502,
       "content": "<pad>",
       "single_word": false,
       "lstrip": false,