Is your feature request related to a problem? Please describe.

I'd like to be able to attribute requests from this library. This is useful for measuring the impact of this project and helping me prioritize engineering resources across our open source connectors.

Describe the solution you'd like

Construct a ClientInfo object and pass to the bigquery.Client constructor whereever we use it.

Describe alternatives you've considered

N/A

Additional context

• Ibis implementation: https://github.com/ibis-project/ibis/blob/165f78de8f4f0121ba2c601b5c9f89bc0f65a593/ibis/backends/bigquery/client.py#L55-L62 and https://github.com/ibis-project/ibis/blob/165f78de8f4f0121ba2c601b5c9f89bc0f65a593/ibis/backends/bigquery/client.py#L407-L411
• Pandas implementation: https://github.com/pydata/pandas-gbq/blob/22a6064ee616fbdd14ce2c8bf8bfe1ed7d3b6291/pandas_gbq/gbq.py#L401-L428