Added support for a read-only flag when connecting to Keeper in ClickHouse.
Why it matters
This feature allows ClickHouse to connect to Keeper in a read-only mode, which helps prevent unintended modifications to the Keeper state. It improves safety and stability for users who want to query Keeper data without risking changes.How to use it
When configuring the Keeper client connection, users can enable the read-only mode by setting the appropriate read-only flag in the connection parameters. This ensures that all interactions with Keeper are in a read-only context.