HPCC-11112 Add FilterBy to WsWorkunits.WUResult

In WUResult request, a name/value array is used to set filters for
retrieving WU result.

Signed-off-by: Kevin Wang kevin.wang@lexisnexis.com
Merge pull request #5773 from wangkx/h11112b

HPCC-11112 Add FilterBy to WsWorkunits.WUResult

Reviewed-By: Gordon Smith <gordon.smith@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>