There's a need to convert both -- version and format -- to string and back. Currently, there's a disperse set of helpers in sstables/ code doing that and this PR brings some other to it
- adds fmt::formatter<> specialization for both types
- leaves one set of {format|version}_from_string() helpers converting any string-ish object into value
refs: #12523Closes#13214
* github.com:scylladb/scylladb:
sstables: Expell sstable_version_types from_string() helper
sstables: Generalize ..._from_string helpers
sstables: Implement fmt::formatter<sstable_format_types>
sstables: Implement fmt::formatter<sstable_version_types>
sstables: Move format maps to namespace scope
77bf90bf7d