HPCC-10617 Add support for Cassandra

Added support for SET parameters and dataset fields

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Yes - there is a column type called MAP that we can set from a 2-field nested dataset, and we can set a Cassandra SET or LIST column from a single-field nested dataset, but they don't support nested datasets in general.