Before this patch, Alternator tables did not use tablets even if this
feature was available - tablets had to be manually enabled per table
by using a tag. But recently we changed CQL to enable tablets by default
on all keyspaces (when the experimental "tablets" option is turned on),
so this patch does the same for Alternator tables:
1. When the "tablets" experimental feature is on, new Alternator tables
will use tablets instead of vnodes. They will use the default choice
of initial_tablets.
2. The same tag that in the past could be used to enable tablets on a
specific table, now can be used to disable tablets or change the
default initial_tablets for a specific table at creation time.
Fixes#16355
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
c496d60716