Sorting Rule (sort)

Sorts the DataFrame by specified columns.

Field	Description	Required
columns	Array of column names to sort by	✅ Yes
ascending	Sort order (true for ascending, false for descending)	❌ No (default: true)

Example:

{
    "type": "sort",
    "columns": ["timestamp", "customer_id"],
    "ascending": true
}

Behavior: Sorts data by timestamp and customer ID in ascending order.