Add entity tokens metadata

entity_tokens.json

@@ -0,0 +1,41 @@
+{
+  "entity_tokens": [
+    "'<|B_00:TI|>'",
+    "'<|B_1:QT|>'",
+    "'<|B_23:39:TI|>'",
+    "'<|B_40\u223c10:00:TI|>'",
+    "'<|B_58:TI|>'",
+    "'<|B_5:QT|>'",
+    "'<|B_;LC|>'",
+    "'<|B_DT|>'",
+    "'<|B_LC|>'",
+    "'<|B_OG \ubd80\ucc9c\uc9c0\uccad \ud615\uc0ac 2\ubd80:OG|>'",
+    "'<|B_OG|>'",
+    "'<|B_PS|>'",
+    "'<|B_QT|>'",
+    "'<|B_TI|>'",
+    "'<|B_\uba85:QT|>'",
+    "'<|E_00:TI|>'",
+    "'<|E_1:QT|>'",
+    "'<|E_23:39:TI|>'",
+    "'<|E_40\u223c10:00:TI|>'",
+    "'<|E_58:TI|>'",
+    "'<|E_5:QT|>'",
+    "'<|E_;LC|>'",
+    "'<|E_DT|>'",
+    "'<|E_LC|>'",
+    "'<|E_OG \ubd80\ucc9c\uc9c0\uccad \ud615\uc0ac 2\ubd80:OG|>'",
+    "'<|E_OG|>'",
+    "'<|E_PS|>'",
+    "'<|E_QT|>'",
+    "'<|E_TI|>'",
+    "'<|E_\uba85:QT|>'"
+  ],
+  "num_tokens": 30,
+  "conversion_info": {
+    "original_format": "<entity:label>",
+    "converted_format": "<|B_LABEL|>entity<|E_LABEL|>",
+    "source_dataset": "klue/klue (ner subset)"
+  },
+  "note": "entity_tokens are stored as repr() strings to handle Unicode characters safely"
+}