update query5 embedded/steps impl for latest spec, but still not complete. work on this query on hold as discussion about Query5 expected behaviour is ongoing
update query6 api/steps impl to be consistent with latest spec
refactor query6 api/steps impl to be more self explanatory
update query7 api/steps impl to be consistent with latest spec
add travers to LdbcTraversers as needed
update query8 api/steps impl to be consistent with latest spec
update query9 api/steps impl to be consistent with latest spec
update query10 api/steps impl to be consistent with latest spec