Create /v1/request/unique

## Description

POST request with body describing the request to send to which target and the expected answer. e.g.:

## Example

```
POST /v1/request/unique
{
    "target": "localhost:8080",
    "path": "/test",
    "body": "{}",
    "expectedAnswer": "200",
}
```

## DOD
- Create the related code
- Add the endpoint to the Helper endpoint
- Add testing