Add Lists.partition() helper method and use in DefaultPersister batch deletion

ebean-api/src/main/java/io/ebean/Lists.java

@@ -0,0 +1,33 @@
+package io.ebean;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Helper methods for Lists.
+ */
+public interface Lists {
+
+  /**
+   * Partition the source List into sub-lists with a maximum size.
+   *
+   * @param max    The max size of each partition
+   * @param source The source list
+   * @param <T>    The list element type
+   * @return List of partitions
+   */
+  static <T> List<List<T>> partition(int max, List<T> source) {
+    final int totalCount = source.size();
+    if (totalCount <= max) {
+      return List.of(source);
+    }
+    final int numOfPartitions = (totalCount + max - 1) / max;  // round up
+    final var dest = new ArrayList<List<T>>(numOfPartitions);
+    for (int i = 0; i < numOfPartitions; i++) {
+      final int from = i * max;
+      final int to = Math.min(from + max, totalCount);
+      dest.add(source.subList(from, to));
+    }
+    return dest;
+  }
+}