Expose AddressableLEDBuffer internal bytes

[DanPeled]

Mostly to for the buffer to be able to be used with the sim class

without this, it is needed to create a helper method / seperate buffer for using the AddressableLEDSim class, such as the folllowing:

public static byte[] toByteArray(AddressableLEDBuffer buffer) {
    int length = buffer.getLength();
    byte[] byteArray = new byte[length * 4];

    for (int i = 0; i < length; i++) {
      byteArray[i * 4] = (byte) buffer.getBlue(i);
      byteArray[(i * 4) + 1] = (byte) buffer.getGreen(i);
      byteArray[(i * 4) + 2] = (byte) buffer.getRed(i);
      byteArray[(i * 4) + 3] = 0; // The last byte is always 0
    }

    return byteArray;
  }

[spacey-sooty]

Needs C++ port

[PeterJohnson]

It doesn't need a C++ port because C++ doesn't have AddressableLEDBuffer; the data is directly accessible.

[spacey-sooty]

It doesn't need a C++ port because C++ doesn't have AddressableLEDBuffer; the data is directly accessible.

Whoops missed that when looking at the C++ version