Add extra DATE_PART units that are already supported in arrow-rs #3502

The following PostgreSQL DATE_PART units are already supported by arrow-rs kernels, and should be straightforward to add to DataFusion:

• quarter: The quarter of the year (1 - 4)
• doy: The day of the year (1 - 365/366)
• dow: The day of the week (0 - 6; Sunday is 0)

See https://www.postgresql.org/docs/8.1/functions-datetime.html

PR to follow