Cast from floating/timestamp to timestamp/floating

[viirya]

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

Similar to #5039, floating types cannot be casted to/from timestamp types for now. This is supported by Spark. We'd like to fill this gap too.

Describe the solution you'd like

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

Describe alternatives you've considered

Additional context

[tustvold]

label_issue.py automatically added labels {'arrow'} from #5123