Added disk_name field to system.part_log

Why it matters

This feature allows users to identify which disk each part is stored on by including the disk name in the system.part_log. It enhances monitoring and debugging by providing detailed storage location information for parts.

How to use it

Users can query the system.part_log table and include the disk_name field in their SELECT statements to see the disk names associated with parts, for example:

SELECT part_name, disk_name, event_type, event_time
FROM system.part_log
WHERE event_date = today()