An object that can be exported to the host.
Calling export writes the object to a path on the host filesystem and returns the path that was written.
@type t() :: %Dagger.Exportable{client: term(), query_builder: term()}
@spec export(t(), String.t()) :: {:ok, String.t()} | {:error, term()}
@spec id(t()) :: {:ok, String.t()} | {:error, term()}