add ability to select sequences for download. currently, it only seems to support downloading of everything in the current filter. Along with that, we would need buttons 'select all', 'deselect all', 'invert selection' [there's probably another issue for this somewhere]
currently, there are only INSDC fields in the table. for data submitted to loculus, we could have links to groups, datasets etc.
Branched from Richard's comment in #1464