HPCC-9682 Add WsWorkunits method to return paged QuerySet Queries

This fix adds new WsWorkunits method 'WUListQueries' to return
QuerySet Queries with paging/sorting options.

Signed-off-by: Kevin Wang <kevin.wang@lexisnexis.com>
HPCC-9682 Rename a method based on review

Signed-off-by: Kevin Wang <kevin.wang@lexisnexis.com>
Merge pull request #4802 from wangkx/h9682

HPCC-9682 Add WsWorkunits method to return paged QuerySet Queries

Reviewed-By: Jake Smith <jake.smith@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>