pack method
Serialize the object using the given builder, returning the offset.
Implementation
@override
int pack(fb.Builder fbBuilder) {
final int? uriOffset = uri == null ? null
: fbBuilder.writeString(uri!);
final int? embeddedImageOffset = embeddedImage?.pack(fbBuilder);
fbBuilder.startTable(2);
fbBuilder.addOffset(0, uriOffset);
fbBuilder.addOffset(1, embeddedImageOffset);
return fbBuilder.endTable();
}