appendBmpImage method
添加bmp图片
`image` bmp图片资源
`pos` x,y 位置
Implementation
Future<void> appendBmpImage(
{required BitmapImage image, required (int, int) pos}) =>
RustLib.instance.api.crateApiTsplTsplCommandBuildAppendBmpImage(
that: this, image: image, pos: pos);