Add cqlsh autocompletion for the vector data type

cqlsh> CREATE TABLE t (v
ascii     boolean   decimal   float     int       set       time      tinyint   varint
bigint    counter   double    frozen    list      smallint  timestamp uuid      vector
blob      date      duration  inet      map       text      timeuuid  varchar

cqlsh> CREATE TABLE t (v vector<
ascii     boolean   decimal   float     int       set       time      tinyint   varint
bigint    counter   double    frozen    list      smallint  timestamp uuid      vector
blob      date      duration  inet      map       text      timeuuid  varchar

cqlsh> CREATE TABLE t (v vector<float,
              <wholenumber>

cqlsh> INSERT INTO t(k, v) VALUES ( 0,
                                 <value for v (vector<float, 3>)>