Adjust Pi evaluator reply structure to the API response

[jhrozek]

The reply looks now as follows:

curl 'https://staging.stacklok.dev/pi/v1/report?package_name=urllib3&package_type=pypi' | jq '.alternatives'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 11774  100 11774    0     0   8730      0  0:00:01  0:00:01 --:--:--  8753
{
  "status": "complete",
  "packages": [
    {
      "package_name": "aiohttp",
      "package_type": "pypi",
      "repo_description": "Rust friendly bindings to *nix APIs (fork with features used in cntr)",
      "score": 6.9
    },
    {
      "package_name": "httpx",
      "package_type": "pypi",
      "repo_description": "Stream based JSON parsing with a Python C-Extension around YAJL",
      "score": 6.6
    },
    {
      "package_name": "httplib2",
      "package_type": "pypi",
      "repo_description": "Small, fast HTTP client library for Python. Features persistent connections, cache, and Google App Engine support. Originally written by Joe Gregorio, now supported by community.",
      "score": 6.1
    },
    {
      "package_name": "treq",
      "package_type": "pypi",
      "repo_description": "Python requests like API built on top of Twisted's HTTP client.",
      "score": 5.9
    }
  ]
}

[lujunsan]

LGTM