Add MergeTree settings to system.settings_changes

Why it matters

This feature enables monitoring and auditing of changes made to MergeTree table-specific settings by logging them into system.settings_changes. It helps users track configuration changes over time, improving manageability and troubleshooting.

How to use it

After upgrading to the version including this feature, users can query the system.settings_changes table to see changes to MergeTree settings. No additional configuration is needed to start tracking these changes.