Uploading files larger than 2.14GB using chunked upload not working

The implementation of `IONFILEReadInChunksOptions.kt` uses a Int to represent the offset. This means, if the file is larger than Int.MAX_VALUE we have an overflow situation resulting in a corrupt file after upload.

A correct implementation using random file access shoudl use a long value. As it's also done in `RandomAccessFile.seek(long pos)` or `FileChannel.position(long position)`.