chore: update log adapter to support session-scoped api method logging

Updates `log_adapter` to optionally store API method names in a `Session` instance instead of the global list. This improves label accuracy when running tests in parallel.

- Updates `Session` to initialize `_api_methods` list and lock.
- Updates `log_adapter.add_api_method` and `get_and_reset_api_methods` to handle session-scoped logging.
- Updates `log_adapter.method_logger` and `property_logger` to identify the session from arguments.
- Propagates `session` through `start_query_with_client` and its callers to ensure labels are correctly associated with the session.

Author: google-labs-jules[bot]

bigframes/core/log_adapter.py

@@ -256,16 +256,16 @@ def add_api_method(api_method_name, session=None):
     global _lock
     global _api_methods
 
+    clean_method_name = api_method_name.replace("<", "").replace(">", "")
+
     if session is not None:
         with session._api_methods_lock:
-            session._api_methods.insert(
-                0, api_method_name.replace("<", "").replace(">", "")
-            )
+            session._api_methods.insert(0, clean_method_name)
             session._api_methods = session._api_methods[:MAX_LABELS_COUNT]
     else:
         with _lock:
             # Push the method to the front of the _api_methods list
-            _api_methods.insert(0, api_method_name.replace("<", "").replace(">", ""))
+            _api_methods.insert(0, clean_method_name)
             # Keep the list length within the maximum limit (adjust MAX_LABELS_COUNT as needed)
             _api_methods = _api_methods[:MAX_LABELS_COUNT]