feat(serialization): add validation support for custom slice types

Enhanced the ConvertSlice function to include validation for destination slices that implement the CustomValidator interface. If validation fails, errors are collected and returned, ensuring data integrity during slice conversion.

internal/serialization/serialization.go

@@ -480,6 +480,14 @@ func ConvertSlice(src reflect.Value, dst reflect.Value, checkValidateTag bool) g
 		}
 		numValid++
 	}
+
+	if dst.Type().Implements(reflect.TypeFor[CustomValidator]()) {
+		err := dst.Interface().(CustomValidator).Validate()
+		if err != nil {
+			sliceErrs.Add(err)
+		}
+	}
+
 	if err := sliceErrs.Error(); err != nil {
 		dst.SetLen(numValid) // shrink to number of elements that were successfully converted
 		return err