perf(s3stream): avoid S3StreamSetObject objectId long primitive unboxing (#2687)

Author: lifepuzzlefun

metadata/src/main/java/org/apache/kafka/metadata/stream/S3StreamSetObject.java

@@ -135,11 +135,11 @@ public static S3StreamSetObject of(S3StreamSetObjectRecord record) {
             record.ranges(), record.orderId(), record.dataTimeInMs());
     }
 
-    public Integer nodeId() {
+    public int nodeId() {
         return nodeId;
     }
 
-    public Long objectId() {
+    public long objectId() {
         return objectId;
     }