BigQueryOption queryPriority is specified in types, but not passed onto BigQuery client

[chribsen]

After migrating from the previous Google BigQuery data source for Grafana, we are no longer able to specify the Job priority on the data source.

After reading through this repository a bit, it seems like the types for implementing queryPriority is already in place (see here). However, the queryPriority value is not getting passed onto the underlying BigQuery client.

It would be quite beneficial to have this as an option, since we don't want our dashboards to getting prioritised before any of our customer-facing queries.