chore!: Sets up google_adk for top level logger namespace. Removes --log_to_tmp option in adk web and adk api_server for the same reason.

Context: google-auth commit [1] broke adk log, because it disables the top level logger named "google", which is also adk's top level logger. We establish a separate top level logger with a different name `google_adk` to prevent this in the future.

This commit only changes google_llm.py. All other files will be changed in later commits.

[1] 77ad53eb00 (diff-e386c2b2c39b4d746c1e257f503acecbde49b1746b1a34f53b57083ed6094161)

PiperOrigin-RevId: 759872317

src/google/adk/models/google_llm.py

@@ -36,7 +36,7 @@ from .llm_response import LlmResponse
 if TYPE_CHECKING:
   from .llm_request import LlmRequest
 
-logger = logging.getLogger(__name__)
+logger = logging.getLogger('google_adk.' + __name__)
 
 _NEW_LINE = '\n'
 _EXCLUDED_PART_FIELD = {'inline_data': {'data'}}