GEOMESA-281 Create a strategy decider function

refactored to create a Decider that decides on Strategy (attribute index, spatiotemporal index or id index)
Strategy executes the query
this will be the framework upon which more complicated cost analysis of query planning is based
Oops, i missed a bunch of collapsed code at the top. Still, I think it would logically make sense to put the decider code here, since this is the QueryPlanner.