Remove masking of personal details

Currently the REST API masks personal details for contacts imported from `ai4europe_cms` (https://github.com/aiondemand/AIOD-rest-api/blob/develop/src/routers/resource_routers/contact_router.py and https://github.com/aiondemand/AIOD-rest-api/blob/develop/src/routers/resource_routers/person_router.py). We now have the permission to show these details so we can remove the mask. E-mail addresses should only be visible to logged in users.

~@AlexJoom should we also show e-mail addresses, or keep them masked?~