Support skewness(x) in Aggregation function #12249
Description
Is your feature request related to a problem or challenge?
Returns the skewness value calculated from values of a group.
Describe the solution you'd like
D SELECT skewness(col) FROM VALUES (-10), (-20), (100), (1000), (1000) AS tab(col);
┌────────────────────┐
│ skewness(col) │
│ double │
├────────────────────┤
│ 0.5745116147533554 │
└────────────────────┘
Describe alternatives you've considered
No response
Additional context
https://docs.databricks.com/en/sql/language-manual/functions/skewness.html
https://duckdb.org/docs/sql/functions/aggregates#skewnessx