Add some dynamic warning messages that can

Why it matters

This feature addresses the need for more flexible and dynamic monitoring of warnings within ClickHouse. By allowing warning messages to be managed dynamically, users can better track and respond to system states and potential issues, improving system observability and management.

How to use it

Users can interact with the system.warnings table to add, update, or remove warning messages dynamically as required. This allows integrating custom warning logic or system alerts directly within ClickHouse without needing to restart or reconfigure the server.