Allow client-side db queries

[ronentk]

• [x] Adding a new firgun:
• Add to list of firguns
• Add update to target user's firgun list
• [x] Getting all firguns
• [x] Get all firguns by user
• [ ] Get all users in radius

[ronentk]

Some Postman requests with the all functionalities except for the radius FirgunApp.postman_collection.json.txt