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75d09059 - Ability to specify credentials wihen using Google BigQuery as a data loader (#5466)

Ability to specify credentials wihen using Google BigQuery as a data loader (#5466) # Adds ability to specify credentials when using Google BigQuery as a data loader Fixes #5465 . Adds ability to set credentials which must be of the `google.auth.credentials.Credentials` type. This argument is optional and will default to `None. Co-authored-by: Dev 2049 <dev.dev2049@gmail.com>