It would be nice to have more type definition for GetFilesResponse -- particularly for the second and third items in the tuple type.

The SDK docs don't specify that these two items exist; the only place I could find documentation about the response body (third item in the tuple) was the docs on the console.

Environment details

• OS: MacOS Ventura 13.4.1
• Node.js version: 16.10.0
• npm version: 7.24.0
• @google-cloud/storage version: 7.0.1

Steps to reproduce

1. Observe the type definition for GetFilesResponse in node_modules
2. Note that the second and third items in the tuple type are not fully typed