D-Net

Update JWTValidator, add a first draft with jwt's exception handling

Update JWTValidator, remove comments

Update HelloWorldService.java, Add Response isValid

Update JWTValidator, check if a jwt token is valid

Update JWTValidator, TODO plan about validation token and testing

Added security package

Adding bulk insert and delete methods

minor changes

in insert claim method new parameters added for access rights and embargo date

More parameters added for fetch methods to include: sorting functionality, filtering by type, filtering by keyword / add the proper parameters in fetch