Remove usage of spi Tuple classes under google-cloud-examples #1791
Description
- https://github.com/GoogleCloudPlatform/google-cloud-java/blob/master/google-cloud-examples/src/main/java/com/google/cloud/examples/bigquery/BigQueryExample.java uses
com.google.cloud.bigquery.spi.v2.BigQueryRpc.Tuple - https://github.com/GoogleCloudPlatform/google-cloud-java/blob/master/google-cloud-examples/src/main/java/com/google/cloud/examples/storage/StorageExample.java uses
com.google.cloud.storage.spi.v1.StorageRpc.Tuple
These tuple definitions are identical; maybe we should just make a Tuple class under core for everything to share.