Instead of treating the returned *lastValue as an aggregator from
newLastValue, just use the type directly to construct the Measure and
ComputeAggregation functions returned from the Builder.
Accept a destination type for the underlying computeAggregation. This
allows memory reuse for collections which adds a considerable
optimization.
Simplify the integration testing of the last-value aggregate.
Update benchmarking.
* Replace filter aggregator with direct filter on measure
Part of #4220
Instead of using an aggregator to filter measured attributes, directly
filter the attributes in the constructed Measure function the Builder
creates.
Include unit and integration testing of new filtering.
* Update sdk/metric/internal/aggregate/aggregate.go
Co-authored-by: David Ashpole <dashpole@google.com>
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Co-authored-by: David Ashpole <dashpole@google.com>
