[feat] Code administration API

[lgrd]

The administration API exists in the project but it must be updated and fully implemented. I see different actions :

• [x] Update api.yaml. See #34
• [x] Code /heath route. See #35
• [ ] Code /configuration routes. See #37
• [ ] Code /services routes. See #66
• [ ] Code /sources routes. See #55
• [ ] Code /resources routes. See #56
• [ ] Code /projections routes. See #65