* [ADF-3912] added abstract class for document-list component to be provided
* [ADF-3912] - created abstract class for document-list service
* [ADF-3912] - fixing and removing the custom resource from document-list
* [ADF-3912] added interface for document list service
* [ADF-3912] added interface for loadFolderById for DL component
* [ADF-3912] fixed missing return type
* [ADF-3912] removed comment
* [ADF-3912] fixed PR comments
* [ADF-3912] fixed wrong import
* [ADF-3912] fixed unit test failing
* [ADF-3912] removed unused method
* [ADF-3912] fixed lint problems
