HPCC-12591 Add new method WsWorkunits.WUGetStats

Return a regular SCM response

Signed-off-by: wangkx <kevin.wang@lexisnexis.com>
We don't want a different measure.  What format do you want and we can ensure that all timestamps come out in that format.  

Currently the format is
YYYY-MM-DD hh:mm:ss.xxx

It should also be UTC rather than local.  If that isn't true it should be fixed.