add id2label and label2id to config file

frameworks can more easily leverage this info at inference so user don't have to handle the dictionary themselves
see other examples:
- https://huggingface.co/clapAI/modernBERT-base-multilingual-sentiment/blob/main/config.json
- https://huggingface.co/argilla/ModernBERT-domain-classifier/blob/main/config.json
- https://huggingface.co/NemoraAi/modernbert-chat-moderation-X-V2/blob/main/config.json

config.json

@@ -19,9 +19,17 @@
   "global_rope_theta": 160000.0,
   "hidden_activation": "gelu",
   "hidden_size": 1024,
+  "id2label": {
+    "0": "Non-refusal", 
+    "1": "Refusal"
+  },
   "initializer_cutoff_factor": 2.0,
   "initializer_range": 0.02,
   "intermediate_size": 2624,
+  "label2id":{
+    "Non-refusal": 0,
+    "Refusal": 1
+  }
   "layer_norm_eps": 1e-05,
   "local_attention": 128,
   "local_rope_theta": 10000.0,