v.23.8Improvement

Added Custom Commands for Easier ClickHouse Debugging

Added a bunch of custom commands (mostly to make ClickHouse debugging easier). #53127 (pufit).
Added several custom commands to the ClickHouse client to facilitate easier debugging and inspection of the ClickHouse server.

Why it matters

The feature aims to improve the debugging experience by providing users with new commands that help inspect and troubleshoot the ClickHouse server state more efficiently. This simplifies diagnostic tasks and accelerates issue resolution.

How to use it

Users can invoke the new custom commands directly within the ClickHouse client as part of their interactive session or scripts. These commands are available without additional configuration and enhance the client's debugging capabilities.