Function time_struct_fields 

pub fn time_struct_fields() -> Fields

Returns the canonical struct field definitions for Time encoding in Arrow.

Time is encoded as a 2-field struct to preserve timezone offset:

• nanos_since_midnight: i64 nanoseconds since midnight (0-86,399,999,999,999)
• offset_seconds: i32 seconds offset from UTC (e.g., +3600 for +01:00)