db: fallback to sizetiered if compaction strategy isn't supported
db: fallback to sizetiered if compaction strategy isn't supported

It may happen that the user will migrate a table to Scylla which
compaction strategy isn't supported yet, such as Data tiered.
Let's handle that by falling back to size-tiered compaction
strategy and printing a warning message.

Signed-off-by: Raphael S. Carvalho <1e2942cea40e3b4d2162dfcd9e53e41c05a84d22@scylladb.com>

avikivity/scylla,scylladb/scylla,duarten/scylla,raphaelsc/scylla,scylladb/scylla,avikivity/scylla,kjniemi/scylla,scylladb/scylla,duarten/scylla,raphaelsc/scylla,kjniemi/scylla,avikivity/scylla,raphaelsc/scylla,scylladb/scylla,duarten/scylla,kjniemi/scylla