[datafusion-spark] add unix_date/micros/millis/seconds functions #19891
Description
Is your feature request related to a problem or challenge?
Add the following spark functions
- https://spark.apache.org/docs/latest/api/sql/index.html#unix_date
- https://spark.apache.org/docs/latest/api/sql/index.html#unix_seconds
- https://spark.apache.org/docs/latest/api/sql/index.html#unix_millis
- https://spark.apache.org/docs/latest/api/sql/index.html#unix_micros
Describe the solution you'd like
No response
Describe alternatives you've considered
No response
Additional context
No response