[FEATURE] Create /info endpoint to return middleware component info

**Feature Description**
create an `/info` endpoint `GET` route on the middleware server to return an `application/json` response as follows:  

```json
{
  "middlewareServer" : {
     "serverVersion": "v0.1.0",
     "commitSha": "abcdef..."
  }
  "stackQL":  {
     "serverVersion": "v2.0.0",
     "commitSha": "abcdef..."
  }
}
```