`stream/status` request duplicates fields and returns inaccurate `pipeline_state`

Example of current `state.get_pipeline_state()` response
```
  "current_state": {
      "status": "OK",
      "state": "OK",
      "error_message": null,
      "pipeline_ready": true,
      "active_streams": 1,
      "startup_complete": true,
      "pipeline_state": "IDLE",
      "additional_info": {}
  }
```