Add ClientOTelMetricsInterceptor and ServerOTelMetricsInterceptor#62

bauer-andreas wants to merge 2 commits intogrpc:maingrpc/grpc-swift-extras:mainfrom

bauer-andreas:andreas-bauer/otel-metrics-interceptorbauer-andreas/grpc-swift-extras:andreas-bauer/otel-metrics-interceptorCopy head branch name to clipboard