Get all resources

[yellalena]

• Add GET /resources endpoint
• Fetch all records from the db
• Dynamically calculate hiddenFrom field value for each record while iterating, add it to frontend’s output. Since hiddenFrom is a field for frontend, it should use frontend’s terminology, i.e. guest instead of public
• Based on hiddenFrom and requestor’s role, apply role filter to hidden_from field.
  If hidden_from = user role → set Description, Attachment, Link to Null and send the result back to Frontend.
• Update swagger
• Add unit tests