Add configs to control aggregate/Window/Orderby Spilling

[pgupta2]

spill_enabled session property enable spills for all operators. Currently, there is
no way to control aggregation/Window/Orderby spilling explicitly. This PR adds configs to
control these 3 operators spilling.

Test plan - Unit tests

== RELEASE NOTES ==

General Changes
* Add a new configuration property ``experimental.aggregation-spill-enabled`` to control aggregate spills explicitly. This can be overridden by ``aggregation_spill_enabled`` session property.
* Add a new configuration property ``experimental.window-spill-enabled`` to control window spills explicitly. This can be overridden by ``window_spill_enabled`` session property.
* Add a new configuration property ``experimental.order-by-spill-enabled`` to control order by spills explicitly. This can be overridden by ``order_by_spill_enabled`` session property.

[rschlussel]

change this and orderby to check isAggregationSpillEnabled() instead of isSpillEnabled(). (or alternatively, just remove the isSpillEnabled check for both since we check all three properties anyway when build the aggregation operator)

[rschlussel]

don't need to pass in spillEnabled anymore since aggregationSpillEnabled includes a check for spillEnabled.

[rschlussel]

Can you also add tests for window and order by in TestSpilledWindowQueries and TestSpilledOrderByQueries

[rschlussel]

One more thing. Can you add documentation to https://github.com/prestodb/presto/blob/master/presto-docs/src/main/sphinx/admin/properties.rst#spilling-properties

[pgupta2]

@rschlussel : Addressed all the comments.

[rschlussel]

just a minor comment

[rschlussel]

can remove the spillEnabled variable now since its unused

[pgupta2]

@rschlussel : This variable is already removed. We now only pass isAggregationSpillEnabled flag along with isDistinctAggregationSpillEnabled and isOrderByAggregationSpillEnabled.

[rschlussel]

sorry got it confused due to collapsed code in github. Looks good.