refactor(client): move AccessToken as a class
refactor(client): move AccessToken as a class

mnubo/smartobjects-js-client,mnubo/mnubo-js-sdk,blemoine/smartobjects-js-client,mnubo/smartobjects-js-client,blemoine/smartobjects-js-client,mnubo/mnubo-js-sdk,mnubo/smartobjects-js-client,mnubo/smartobjects-js-client