added ContentFormatter escape special characters for message content (#10319)

---------

Co-authored-by: Manikanta5112 <42089393+mani5112@users.noreply.github.com>

libs/langchain/langchain/chat_models/azureml_endpoint.py

@@ -24,16 +24,36 @@ class LlamaContentFormatter(ContentFormatterBase):
     def _convert_message_to_dict(message: BaseMessage) -> Dict:
         """Converts message to a dict according to role"""
         if isinstance(message, HumanMessage):
-            return {"role": "user", "content": message.content}
+            return {
+                "role": "user",
+                "content": ContentFormatterBase.escape_special_characters(
+                    message.content
+                ),
+            }
         elif isinstance(message, AIMessage):
-            return {"role": "assistant", "content": message.content}
+            return {
+                "role": "assistant",
+                "content": ContentFormatterBase.escape_special_characters(
+                    message.content
+                ),
+            }
         elif isinstance(message, SystemMessage):
-            return {"role": "system", "content": message.content}
+            return {
+                "role": "system",
+                "content": ContentFormatterBase.escape_special_characters(
+                    message.content
+                ),
+            }
         elif (
             isinstance(message, ChatMessage)
             and message.role in LlamaContentFormatter.SUPPORTED_ROLES
         ):
-            return {"role": message.role, "content": message.content}
+            return {
+                "role": message.role,
+                "content": ContentFormatterBase.escape_special_characters(
+                    message.content
+                ),
+            }
         else:
             supported = ",".join(
                 [role for role in LlamaContentFormatter.SUPPORTED_ROLES]