API: run code route

[alexis-langlet]

For the API we want to implement the first route :
We will be using http and json schemas
POST /run
The json body should be like this :

{
  "language": "rust",
  "version": "1.0.0",
  "input": "<input>",
  "code": [
    {
      "filename": "main.rs",
      "content": "<code>"
    }
  ]
}

This should return :

{
  "status": 0,
  "stdin": "<stdin>",
  "stderr" : "<stderr>"
}