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Description
Is your feature request related to a problem or challenge?
As part of #9285 the from_unixtime, now, current_date, current_time datetime functions should be migrated to the new datafusion-functions crate in the new structure
Describe the solution you'd like
Functions are migrated to the new crate and use the new patterns as described in #9286 & #9216,
Describe alternatives you've considered
No response
Additional context
No response