* 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>
