Add v2 version for units project to accomodate new bytes API

Signed-off-by: Luis Pinto <luis.pinto@consensys.net>

Author: lu-pinto

units/src/main/java/org/apache/tuweni/units/bigints/Utils.java

@@ -0,0 +1,47 @@
+// Copyright The Tuweni Authors
+// SPDX-License-Identifier: Apache-2.0
+package org.apache.tuweni.units.bigints;
+
+public class Utils {
+  static void and(
+      int[] sourceBytesArray, int sourceOffset, byte[] destBytesArray, int destOffset, int length) {
+    for (int i = 0; i < length; i++) {
+      // TODO: Speed this up with SIMD
+      destBytesArray[destOffset + i] =
+          (byte) (unpackByte(sourceBytesArray, sourceOffset + i) & destBytesArray[destOffset + i]);
+    }
+  }
+
+  static void or(
+      int[] sourceBytesArray, int sourceOffset, byte[] destBytesArray, int destOffset, int length) {
+    for (int i = 0; i < length; i++) {
+      // TODO: Speed this up with SIMD
+      destBytesArray[destOffset + i] =
+          (byte) (unpackByte(sourceBytesArray, sourceOffset + i) | destBytesArray[destOffset + i]);
+    }
+  }
+
+  static void xor(
+      int[] sourceBytesArray, int sourceOffset, byte[] destBytesArray, int destOffset, int length) {
+    for (int i = 0; i < length; i++) {
+      // TODO: Speed this up with SIMD
+      destBytesArray[destOffset + i] =
+          (byte) (unpackByte(sourceBytesArray, sourceOffset + i) ^ destBytesArray[destOffset + i]);
+    }
+  }
+
+  static byte unpackByte(int[] ints, int index) {
+    int whichInt = index / 4;
+    return unpackByte(ints[whichInt], index);
+  }
+
+  static byte unpackByte(int integer, int index) {
+    int whichIndex = 3 - index % 4;
+    return (byte) ((integer >> (8 * whichIndex)) & 0xFF);
+  }
+
+  static byte unpackByte(long value, int index) {
+    int whichIndex = 7 - index;
+    return (byte) ((value >> (8 * whichIndex)) & 0xFF);
+  }
+}