Implement `ducklake_table_changes()` for queries

[shefeek-jinnah]

Description
Add support for change data capture (CDC) queries via a new ducklake_table_changes() table function. The function returns row-level changes between two snapshots, including INSERT, UPDATE, and DELETE operations. Changes are derived by diffing data and delete files across the specified snapshot range and exposing the resulting rows with an explicit change_type column.

Desired behavior:

SELECT * FROM ducklake_table_changes('main.users', 5, 10);
-- Returns: change_type, snapshot_id, and row data