before this change, we rely on the default-generated fmt::formatter
created from operator<<, but fmt v10 dropped the default-generated
formatter.
in this change, we define formatters for
* tablet_id
* tablet_replica
* tablet_metadata
* tablet_map
their operator<<:s are dropped
Refs scylladb/scylladb#13245
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closesscylladb/scylladb#17504