Bump up the sequence cache size from 64 to 1024.

Prevents sequence writing from becoming a bottleneck when doing bulk load.

h2/src/main/org/h2/schema/Sequence.java

@@ -24,7 +24,7 @@ public class Sequence extends SchemaObjectBase {
     /**
      * The default cache size for sequences.
      */
-    public static final int DEFAULT_CACHE_SIZE = 32;
+    private static final int DEFAULT_CACHE_SIZE = 1024;
 
     private long value;
     private long valueWithMargin;