GEOMESA-311,312 Handle spatial-temporal and attribute filters and querie...

...s containing multiple attribute filters

Geo & attr gets a StIdxStrategy; attr & geo uses an AttrIdxStrategy. Added
additional filters to test this behavior.
If multiple attribute filters are indexable, use the first one as index and apply the rest as a filter
In the future, a query optimizer will make more informed strategy decision
yeah, dates are indexed as attributes. If we have a date and a geom, it's probably best to use the ST index. If there's no geom, then the attr index would probably be better.