Merge branch 'expo-histo-aggregation-4' of http://github.com/ethandmd/opentelemetry-cpp into expo-histo-aggregation-4

Author: ethandmd

sdk/test/metrics/sync_metric_storage_histogram_test.cc

@@ -18,6 +18,7 @@
 #include "opentelemetry/nostd/function_ref.h"
 #include "opentelemetry/nostd/span.h"
 #include "opentelemetry/nostd/variant.h"
+#include "opentelemetry/sdk/metrics/data/circular_buffer.h"
 #include "opentelemetry/sdk/metrics/data/metric_data.h"
 #include "opentelemetry/sdk/metrics/data/point_data.h"
 #include "opentelemetry/sdk/metrics/instruments.h"