NewClient creates a new Client for GCS.

WithGCS configures a Client with a custom GCS implementation.

AuthConfig matches Langley format.

Client implements a backend.Client for GCS.

Config defines gcs connection specific parameters and authetication credentials.

GCSImpl implements GCS interaface.

GCS defines the operations we use in the GCS api.

Option allows setting optional Client parameters.

UserAuthConfig defines authentication configuration overlayed by Langley.