rhatgadkar-goog

feat: add bytes_sent and bytes_received as metrics

2

Port of CloudSQL's https://github.com/GoogleCloudPlatform/cloud-sql-go-connector/pull/856 Fixes https://github.com/GoogleCloudPlatform/alloydb-go-connector/issues/607

wantLastValueMetric() is not verifying the last value of a metric

2

[This line](https://github.com/GoogleCloudPlatform/alloydb-go-connector/blob/main/metrics_test.go#L179) passes in `TestDialerWithMetrics` if the wanted value is set to `1`. This is because `wantLastValueMetric()` is not correctly verifying the last value of a metric. It currently checks...