type_codec: add vector type encoding

This change has been introduced to enable CQL drivers to recognize
vector type in query results.

The encoding has been imported from Apache Cassandra implementation
to match Cassandra's and latest drivers' behaviour.

Co-authored-by: Dawid Pawlik <501149991dp@gmail.com>

transport/server.cc

@@ -21,6 +21,7 @@
 #include "types/list.hh"
 #include "types/set.hh"
 #include "types/map.hh"
+#include "types/vector.hh"
 #include "dht/token-sharding.hh"
 #include "service/migration_manager.hh"
 #include "service/storage_service.hh"
@@ -1952,6 +1953,11 @@ public:
             }
             return;
         }
+        if (type->is_vector()) {
+            r.write_short(uint16_t(type_id::CUSTOM));
+            r.write_string(type->name());
+            return;
+        }
         if (type->is_collection()) {
             auto&& ctype = static_cast<const collection_type_impl*>(type.get());
             if (ctype->get_kind() == abstract_type::kind::map) {