Add exporter/metricbatcher to split metric batches into 200 points#1111

dashpole wants to merge 1 commit into

GoogleCloudPlatform:mainGoogleCloudPlatform/opentelemetry-operations-go:mainfrom

dashpole:temp_batcher_aiodashpole/opentelemetry-operations-go:temp_batcher_aioCopy head branch name to clipboard