[Windowing] `ORDER BY .. NULLS FIRST / LAST` not implemented

[ohaibbq]

WITH toks AS (
  SELECT DATETIME "2024-01-07 00:00:00" as dt
  UNION ALL SELECT DATETIME "2024-01-01 00:00:00"
  UNION ALL SELECT null
)
SELECT dt,
ROW_NUMBER() OVER (ORDER BY dt DESC NULLS FIRST),
ROW_NUMBER() OVER (ORDER BY dt DESC NULLS LAST)
FROM toks

Expected

dt	rn1	rn2
2024-01-07 00:00:00	2	1
2024-01-01 00:00:00	3	2
null	1	3

Actual

dt	rn1	rn2
2024-01-07 00:00:00	2	2
2024-01-01 00:00:00	3	3
null	1	1

[ohaibbq]

Null ordering can be added to the parser here https://github.com/goccy/go-zetasqlite/blob/main/internal/formatter.go#L1055-L1058 via item.NullOrder()