- Added ProxyConfig and ProxyPool structures to manage proxy settings and rotation.
- Implemented normalization functions for proxy URLs and configurations.
- Created a new ProxyPool that supports failure tracking and round-robin selection.
- Integrated proxy handling into the ResilientSearcher for search queries.
- Added integration tests for various proxy scenarios including SOCKS5 and HTTP proxies.
- Updated server and resilience stats to include proxy information.
- Refactored search functions to utilize the new proxy client.
- Removed direct proxy handling from search_raw.go and yandex/search_raw.go, using the new core proxy client instead.
- Added unit tests for proxy configuration and pool behavior.
