Cast from integer/timestamp to timestamp/integer

[viirya]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

Only Int64 can be casted to/from Timestamp for now. In Spark, other integer types can be casted to/from Timestamp type as like Int64 (i.e., LongType). We'd like to fill this gap in cast kernel too.

Describe the solution you'd like

Supporting casting from integer/timestamp to timestamp/integer by cast kernel.

Describe alternatives you've considered

Additional context

[tustvold]

label_issue.py automatically added labels {'arrow'} from #5040