Implement GSP-90, GSP-97, GSP-109 and GSP-117 (#27)

* Implement GSP-109: Redesign Features

* Implement GSP-117: Rename Service to System as the Opposite to Global

* pkg/endpoint deprecated by go-endpoint

* Implement GSP-97 Add Restrictions In Storage Metadata

* GSP-90 Re-support Initialization via Connection String

* Fix direr test failed

* Update error code for direr

* Upgrade go-integration-test to 4.1.1

Author: JinnyYi