feat: implemented extra log level for LLM token stream

.logging_config.yaml

@@ -3,6 +3,7 @@ version: 1
 custom_levels:
   OBSERVATION: 25
   ACTION: 26
+  LLM: 9
 
 formatters:
   # Console output
@@ -26,7 +27,7 @@ handlers:
     stream: ext://sys.stdout
   ui:
     class: zmq.log.handlers.PUBHandler
-    level: DEBUG
+    level: LLM
     formatter: json_experiment
 
 # Level of external libraries
@@ -36,5 +37,5 @@ root:
 
 loggers:
   control_backend:
-    level: DEBUG
+    level: LLM
     handlers: [ui]