GEOMESA-118 Implement handling for more complex geometric filter

* Pushes geometric ECQL filters into the STII/IndexIterator.
 This enables improved handling for other topological predicates along with conjunctions.
Ooo...  that sound shiny.  In my current scheme, I think that might come after rewrite-pimping.  Once the rewrite rules are more nuanced, then we will need to process more involved geometric predicates.  

That's probably 4 or 5 PRs out.