Support Graalvm native image

[SingingBush]

I've done some testing with Quarkus Native and found that after building a native executable there are runtime issues. It's worth investigating a little further as it may well be possible to get things working with some configuration properties

[SingingBush]

I've made some changes to barcode4j that enable the library to be used in a native build. However it does require manually registering an instance of ImageIOBitmapEncoder (something that was previously done only by classname).

BitmapEncoderRegistry.register(new ImageIOBitmapEncoder(), 0);

example code is along the lines of:

final Code39Bean barcode = new Code39Bean();
barcode.setWideFactor(3);
barcode.setModuleWidth(UnitConv.in2mm(1.0f / dpi));
barcode.doQuietZone(false);

final File outputFile = new File(String.format("out-%s.bmp", Instant.now().getEpochSecond()));

try (final OutputStream out = new FileOutputStream(outputFile)) {

    BitmapEncoderRegistry.register(new ImageIOBitmapEncoder(), 0); // required changes in barcode4j

    final BitmapCanvasProvider canvas = new BitmapCanvasProvider(out, MimeTypes.MIME_JPEG, dpi, BufferedImage.TYPE_BYTE_BINARY, false, 0);

    //Generate the barcode
    barcode.generateBarcode(canvas, "0123456789");

    //Signal end of generation
    canvas.finish();
} catch (final IOException e) {
    log.error("IO exception while generating barcode", e);
    throw new RuntimeException(e);
}

There are a few more areas that will require changes as well (see todo comments in e1e143e).

Once these issues are resolved and more testing has been done then using barcode4j within a Quarkus native build should be straight forward.