Add Simple server to test if Api is implemented correctly

[dbrasseur-aneo]

Currently, our tests in Api can't tell if the Api has been implemented correctly, or fully. A simple "control place" type server should be implemented to check :

• That the APIs are implemented correctly (can connect to the simple server and send/receive requests/response)
• Report the Api that have been checked
• Define which Api must/should/may be implemented for a given version to pass the CI
• (Maybe, check that the Api is used correctly (state machine check or order of requests validation)