Must decompress before splitting
Must decompress before splitting

The splitting code doesn't work with compressed files, and I don't want
to change it to as python is very slow at decompression. This should fix
that limitation.

RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline