ApiSMWInfo eliminate use of wfGetDB/estimateRowCount() use ['OWNPAGE']

* Change proppagecount to use ['OWNPAGE'] instead of wfGetDB/estimateRowCount()
* Add querycount ['QUERY']
* Add querysize ['QUERYSIZE']
* Add conceptcount ['CONCEPTS']
* Add subobjectcount ['SUBOBJECTS']

Bug: 46458 (add some more general statistics to the smwinfo api)

Change-Id: I1114568c676863da0735e7096846b2c1d45edcbf