Support for keeper/keeper_server Config Sections as Zookeeper Alternative

Why it matters

This feature provides users with the flexibility to configure ClickHouse using keeper/keeper_server sections instead of the traditional zookeeper section. It simplifies configuration management and aligns with evolving service naming conventions, making it easier to maintain and migrate setups involving ClickHouse Keeper.

How to use it

To use this feature, update your ClickHouse configuration file to replace or add the keeper or keeper_server sections in place of the zookeeper section. The existing configuration semantics remain the same, allowing a smooth transition.