lwt: check for unsupported collection type in condition element access
lwt: check for unsupported collection type in condition element access

We don't support conditions with element access on non-frozen UDTs,
check that only supported collection types are supplied.

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