Add support for BigQuery service accounts

[williebsweet]

Is your feature request related to a problem? Please describe.
I'd like to use the data-diff with a BigQuery service account. The current implementation only allows for auth through gcloud auth application-default login. Using a BigQuery Service account requires auth via gcloud auth activate-service-account.

Describe the solution you'd like
A connection that supports gcloud auth activate-service-account

[dlawin]

Hey @williebsweet, are you using the "service account file" described here? https://docs.getdbt.com/docs/core/connect-data-platform/bigquery-setup#service-account-file

Or something else?

[williebsweet]

Hey @williebsweet, are you using the "service account file" described here? https://docs.getdbt.com/docs/core/connect-data-platform/bigquery-setup#service-account-file

@dlawin Yes, I am.

[dlawin]

Hey @williebsweet this is available in 0.7.9, lmk if you run into any issues

[williebsweet]

Thanks @dlawin!