System.query_log: Change Data Type of Type Column to Enum

Why it matters

The change improves the efficiency and clarity of the type column by using the Enum data type, which optimizes storage and query performance for this field in the system.query_log table.

How to use it

Users can immediately benefit from this change when querying the type column in the system.query_log table as it now uses the Enum data type, requiring no additional configuration or setup.