Add missing imports to java/kotlin

Author: svix-mman

codegen/templates/java/types/struct_enum.java.jinja

@@ -33,6 +33,7 @@ import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.List;
 import java.util.Objects;
 import java.net.URI;
 import java.time.OffsetDateTime;

codegen/templates/kotlin/types/struct_enum.kt.jinja

@@ -15,6 +15,7 @@ import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonElement
 import kotlinx.serialization.json.buildJsonObject
 import kotlinx.datetime.Instant
+import com.svix.kotlin.MaybeUnset
 
 
 @Serializable(with = {{ type_name }}Serializer::class)