feat: add capability to track LLM calls by task and agent (#3087)

* feat: add capability to track LLM calls by task and agent

This makes it possible to filter or scope LLM events by specific agents or tasks, which can be very useful for debugging or analytics in real-time application

* feat: add docs about LLM tracking by Agents and Tasks

* fix incompatible BaseLLM.call method signature

* feat: support to filter LLM Events from Lite Agent

tests/custom_llm_test.py

@@ -1,5 +1,4 @@
 from typing import Any, Dict, List, Optional, Union
-from unittest.mock import Mock
 
 import pytest
 
@@ -31,6 +30,8 @@ class CustomLLM(BaseLLM):
         tools=None,
         callbacks=None,
         available_functions=None,
+        from_task=None,
+        from_agent=None,
     ):
         """
         Mock LLM call that returns a predefined response.