algo: Rework storage classes.

Reworked storage classes:

• Use fles::InputArchive / fles::OutputArchive to read / write archives
• Reuse fles::ArchiveDescriptor as archive header
• Removed --split-output-per-ts flag
• Update RecoResultsDescriptor to include timeslice-index and start time
• Added --dump-archive flag to quickly inspect written archives for basic debugging
• Removed ability to add wildcards in output filename e.g. for hostname (this should be handled by slurm-startscript)

Note: marked as draft because MR depends on !1221 (merged).