New creates a new client interface for use with building requests that contain the necessary auth headers.

DefaultIDHeader is the default header key used via Interface.WithHeader.

ExpiringTokenOptions contains values that match those used in the tutorial at https://learnk8s.io/microservices-authentication-kubernetes.

LongLivedTokenOptions contains values that match the default behavior for long-lived (no expiry) service account tokens.

Options may be passed to New when creating a client Interface.

Interface provides methods for working with client IDs as provided by service account tokens.