Implemented keep alive and audit logging; minor improvements

gms-ui/package-lock.json

gms-ui/package.json

gms-ui/src/App.vue

gms-ui/src/api/mock/index.js

gms-ui/src/api/server/index.js

gms-ui/src/components/modals/AddGroupModal.vue

gms-ui/src/components/modals/RenameGroupModal.vue

...in/java/it/inaf/ia2/gms/authn/CustomIdTokenConverter.java

gms/src/main/java/it/inaf/ia2/gms/authn/JWTFilter.java

gms/src/main/java/it/inaf/ia2/gms/authn/OAuth2Config.java

gms/src/main/java/it/inaf/ia2/gms/authn/SecurityConfig.java

...in/java/it/inaf/ia2/gms/authn/ServiceBasicAuthFilter.java

gms/src/main/java/it/inaf/ia2/gms/authn/SessionData.java

...ain/java/it/inaf/ia2/gms/controller/GroupsController.java

.../java/it/inaf/ia2/gms/controller/KeepAliveController.java

...in/java/it/inaf/ia2/gms/controller/MembersController.java

...ava/it/inaf/ia2/gms/controller/PermissionsController.java

...va/it/inaf/ia2/gms/exception/LoggingExceptionHandler.java

gms/src/main/java/it/inaf/ia2/gms/persistence/JoinDAO.java

...src/main/java/it/inaf/ia2/gms/persistence/LoggingDAO.java