The state for AppStore.Token.Server.
AppStore.Token.Server
@type config() :: %{ issuer_id: binary(), bundle_id: binary(), key: %{id: binary(), pem: binary()} }
@type t() :: %AppStore.Token.Server.State{config: config(), token_info: token_info()}
@type token_info() :: %{token: binary(), claims: map()}