Support node-cassandra-cql

Excerpt from the Cassandra spec:

Cassandra CQL KVs

These apply to CQL-based requests, which features SQL-like queries. One example of this is in our Java instrumentation support for the Datastax driver featuring CQL. It is essentially the same as the Query-spec, with the below noted modifications.

Query - CQL query text (consider fingerprinting)
Flavor - Must be cql
Keyspace - (optional) The name of the keyspace defined in the Cassandra Session for querying, this is similar to the Database schema in a relational database.
ConsistencyLevel - (optional) The consistency level specifies how many replicas must respond to a read/write request before the data/acknowledgement is returned to the client
ClusterName - (optional) The name of the Cassandar cluster that the session is querying on