Add configurable retries and delays for clickhouse-copier

Why it matters

This feature addresses the need to handle transient failures during data copy processes by allowing users to specify the number of retry attempts and the delay interval between retries. It improves reliability and resilience of the clickhouse-copier tool, reducing manual intervention and ensuring smoother data migrations or copying tasks.

How to use it

Users can enable and configure this feature by setting the retry count and delay parameters in the clickhouse-copier configuration. This typically involves specifying the desired number of retries and the delay duration between attempts in the copier's config file or command line options.