google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/TableResult.java does unnecessary boxing

This line is unnecessarily using a boxed `Long` instead of a `long`:

https://github.com/googleapis/java-bigquery/blob/421c8250de28b33fb5d2e175b88f1042194f8dc2/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/TableResult.java#L42

Future version of AutoValue report a diagnostic for this issue: https://github.com/google/auto/commit/328a25c161b4423ff71b38054d3f2502da394d37