alternator: remove unused code
alternator: remove unused code

Remove the incomplete and unused function to convert DynamoDB type names
to ScyllaDB type objects:

DynamoDB has a different set of types relevant for keys and for attributes.
We already have a separate function, parse_key_type(), for parsing key
types, and for attributes - we don't currently parse the type names at
all (we just save them as JSON strings), so the function we removed here
wasn't used, and was in fact #if'ed out. It was never completed, and it now
started to decay (the type for numbers is wrong), so we're better off
completely removing it.

Signed-off-by: Nadav Har'El <625169824b719df98706d88646d0aae6f368ae4d@scylladb.com>

scylladb/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla