chore: Replace print statements with logging in ADK

Co-authored-by: George Weale <gweale@google.com>
PiperOrigin-RevId: 864588921

src/google/adk/evaluation/evaluation_generator.py

@@ -16,6 +16,7 @@ from __future__ import annotations
 
 import copy
 import importlib
+import logging
 from typing import Any
 from typing import AsyncGenerator
 from typing import Optional
@@ -49,6 +50,8 @@ from .simulation.user_simulator import Status as UserSimulatorStatus
 from .simulation.user_simulator import UserSimulator
 from .simulation.user_simulator_provider import UserSimulatorProvider
 
+logger = logging.getLogger("google_adk." + __name__)
+
 _USER_AUTHOR = "user"
 _DEFAULT_AUTHOR = "agent"
 
@@ -117,7 +120,7 @@ class EvaluationGenerator:
 
     with open(session_path, "r") as f:
       session_data = Session.model_validate_json(f.read())
-      print("loaded session", session_path)
+      logger.info("Loaded session %s", session_path)
 
     for data in eval_dataset:
       # load session data from session_path