GoogleCloudProvider beta 2

This release adopts the new extension API for services on Application and Request.
Now you can setup google cloud credentials globally and setup a specific API individually through Application

app.googleCloud.credentials = try GoogleCloudCredentialsConfiguration(projectId: "myprojectid-12345", credentialsFile: "~/path/to/service-account.json")

app.googleCloud.storage.configuration = .default()

func uploadImage(_ req: Request) throws {
/// req.gcs gives access to the cloud storage client.
    req.gcs.object.createSimpleUpload(bucket: "vapor-cloud-storage-demo",
                                      data: Data(...),
                                      name: "my-image",
                                      contentType: "image/jpeg").flatMap { uploadedObject in
        print(uploadedObject.mediaLink) // prints the download link for the image.
    }
}