Time predicates

[treagod]

This PR introduces time-based field transforms that allow filtering records based on
specific components of date and datetime fields (year, month, day, hour, minute, second).

What's New

Field Transforms Available:

• year - Extract year from date/datetime fields
• month - Extract month from date/datetime fields
• day - Extract day of month from date/datetime fields
• hour - Extract hour from datetime fields
• minute - Extract minute from datetime fields
• second - Extract second from datetime fields

By default each time predicate will be combined with the exact predicate, but they can be combined with any other non-transform predicate, e.g. created_at__year__lt.

Closes #237