This changes the statistics merging to use the `Add` method on the
entire statistics struct instead of only the metadata. The purpose of
this is that we want to utilize the existing function for merging the
statistics so that additional properties can be added without modifying
the query controller.
At the same time, there are certain properties that are computed in the
controller and we want to ensure they aren't double counted if flux
starts computing these itself. So we blacklist certain attributes that
we compute so that if flux is modified to return these values, we just
ignore them until we change our own code to use those values.
In immediate terms, we're changing to use the `Add` method so that we
can add profiles to the statistics and have those profiles propagate to
the query controller. This property doesn't exist yet so we can't add it
and we don't want to add it after flux is modified because it could
break the operator profile.
But, we also don't want to only use `Add` because we want to move the
properties such as `TotalAllocated` and `TotalDuration` into flux itself
and to remove the controller. But, the controller needs to be compatible
with whatever changes we make to flux so that there's no circumstance
where functionality stops working.
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