Return an array where each entry is an object with this form:

{ source: "fitbit", name: "Fitbit", usernames: ["beau", "madprime"] }

GET /api/public-data/members-by-source/?source=direct-sharing-159
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Content-Type: application/json
Expires: Tue, 09 Aug 2022 11:48:24 GMT
Vary: Accept

{
    "count": 51,
    "next": null,
    "previous": null,
    "results": [
        {
            "source": "direct-sharing-159",
            "name": "GitHub Data Import",
            "usernames": [
                "madprime",
                "gerwitz",
                "ehershey",
                "wolfgang8741",
                "afrendeiro",
                "ArloJamesBarnes",
                "gedankenstuecke",
                "benc",
                "agoramachina",
                "grantmeadors",
                "MxRemy",
                "stephenbrad",
                "ivanshim",
                "arvkevi",
                "mcescalante",
                "Manaswini",
                "Crewest",
                "Zii",
                "vanntile",
                "carolinux",
                "Asutosh",
                "VijayTadimeti",
                "cleder",
                "Elly98",
                "zergs",
                "svemagie",
                "Noinden",
                "stephthegeek",
                "Razalgulq3",
                "hjemmel",
                "NikhilVats",
                "mavaddat",
                "NICKFNBLUM",
                "tadimetv",
                "erb",
                "tadimetv945",
                "jimzim",
                "00waves",
                "matfax",
                "weiququ",
                "thefedoration",
                "ldorigo",
                "npkk75",
                "PovG",
                "EnricGTorrents",
                "yala",
                "eren42",
                "Kimber533",
                "googlier",
                "Haleyd2232",
                "galshefi"
            ]
        }
    ]
}