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.
We may want to consider adding another ticket for (sometime later) trying to simplify geometries.  Not only might this reduce the workload on the tablet-servers (slightly), but it could allow us to skip geometric filtering entirely if the criteria jointly amount to `Filter.INCLUDE` or `Filter.EXCLUDE`.