before this change, `scylla sstable shard-of` didn't support tablets,
because:
- with tablets enabled, data distribution uses the scheduler
- this replaces the previous method of mapping based on vnodes and shard numbers
- as a result, we can no longer deduce sstable mapping from token ranges
in this change, we:
- read `system.tablets` table to retrieve tablet information
- print the tablet's replica set (list of <host, shard> pairs)
- this helps users determine where a given sstable is hosted
This approach provides the closest equivalent functionality of
`shard-of` in the tablet era.
Fixesscylladb/scylladb#16488
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
