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
And this one?
"attr2 = 'val56' AND dtg BETWEEN '2010-07-01T00:00:00.000Z' AND '2010-07-31T00:00:00.000Z'"