Enhance recommendation service with new gRPC endpoints and refactor code

- Added `get_ml_feed_clean_v1` and `get_ml_feed_nsfw_v1` methods to `video_recommendation.proto` and corresponding implementations in `video_recommendation_pb2_grpc.py`.
- Updated `feed_rec_server.py` to integrate new clean and NSFW feed functionalities.
- Refactored existing code for improved readability and consistency, including formatting changes and code organization.
- Introduced `ping_local_report_filtered.py` and `ping_server_report_endpoint.py` for testing new report-filtered endpoints.
- Adjusted BigQuery client logging and query handling for better debugging.

Author: Jay-523

python_src/recommendation_service/feed_rec_server.py

@@ -34,6 +34,7 @@
 _PROCESS_COUNT = multiprocessing.cpu_count()
 # _PROCESS_COUNT = 1  # TODO: stage change book mark
 _THREAD_CONCURRENCY = 10  # heuristic
+# _THREAD_CONCURRENCY = 1  # heuristic TODO: stage change book mark
 _BIND_ADDRESS = "[::]:50059"  # Fixed bind address