Add chrono::Offset import needed for .fix() method

The previous commit removed chrono::prelude::* but the Offset trait
is needed for calling .fix() on TzOffset.

Author: ShreyeshArangath

native-engine/datafusion-ext-functions/src/spark_dates.rs

@@ -22,7 +22,7 @@ use arrow::{
     compute::{DatePart, date_part},
     datatypes::{DataType, TimeUnit},
 };
-use chrono::{Duration, LocalResult, NaiveDate, TimeZone, Utc, prelude::*};
+use chrono::{Duration, LocalResult, NaiveDate, Offset, TimeZone, Utc, prelude::*};
 use chrono_tz::Tz;
 use datafusion::{
     common::{DataFusionError, Result, ScalarValue},