fix: Implement file writing directly for VortexSink instead of DataFusion demuxer
#23
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🗣 Description
FileSinkand Demuxer when a target file size is specified, as the DataFusion demuxer has no guarantees on file size - only row count. As the required number of rows to reach a particular file size is dynamic based on the contents of those rows, we cannot use the Demuxer to reliably reach target file sizes.