Add test for mango "in" with subquery

[snimavat]

@basejump

Trying to get "in" subquery working : i wanted to use it here

[snimavat]

The goal of this PR is to get subqueries working as closure, and we should be able to deep props with dots in subquery

Eg this kind of queries as below

I wanted to use it like

CustFamily.query {                  
      or {
          eq "parent.id", eldestParent.id //All uncles
          "in" "parent.id", {
               eq "parent.id", eldestParent.id
               projections { property("child.id")
          }
      }
}

which is equivalent to

List<Long> uncles = CustFamily.query("parent.id": eldestParent.id).projections { property("child.id")}.list() as List<Long>
CustFamily.query {         
    or {         
             eq "parent.id", eldestParent.id //All uncles
              inList("parent.id", uncles) //childs of uncles                    
          }
    }