[FEATURE] Option to exclude deletion operations

[bazhanius]

Use Case Description

We use CH for long-term storage and analytics. There is a lot of data, and MySQL's performance is decreasing, but CH is fine. We would like to periodically delete old MySQL records, but keep them in CH.

Proposed Solution

Add an option in the config to exclude (disable/ignore) deletion operations so that only new inserts and updates participate in migration. The option should work both with a one-time migration and in real time.

[bakwc]

Added config option ignore_deletes in v0.0.82, please update and check if it works for you.