add Notification & rgpd configuration backend
feature :(IAV-340)add config notifications feature :(IAV-346)add config rgpd
- Add getNotificationConfig and updateNotificationConfig
- Add getRgpdConfig and updateRgpdConfig
- Add in HrAgentConfigServiceImpl notification config GET/PUT logic
- Add in HrAgentConfigServiceImpl rgpd config GET/PUT logic
- Add HrAgentConfigController with GET/PUT /configuration/notification endpoints
- Add HrAgentConfigController with GET/PUT /configuration/rgpd endpoints
- Add in Configuration class in Paths.java notification & rgpd paths