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-186
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Content-Type: application/json
Expires: Fri, 07 Oct 2022 10:33:04 GMT
Vary: Accept

{
    "count": 48,
    "next": null,
    "previous": null,
    "results": [
        {
            "source": "direct-sharing-186",
            "name": "Overland connection",
            "usernames": [
                "da5id",
                "jenie",
                "msantolini",
                "nobismRogierKoning",
                "svemagie",
                "areddick70",
                "assimowitsch",
                "cowninja",
                "gedankenstuecke",
                "msa142",
                "Iain",
                "johnthomaskennedy",
                "marktron",
                "MaxDietrich",
                "stephenbrad",
                "plaetzchen",
                "flamenquim",
                "ehershey",
                "ArloJamesBarnes",
                "oguzhanogreden",
                "Explore360",
                "madprime",
                "thepatrick",
                "MichaelR",
                "kirand",
                "mlaker88",
                "LioChan",
                "benc",
                "Agaricus",
                "MuscleNerdJock",
                "stijn",
                "bmericc",
                "dkavraal",
                "rbates",
                "torstenschramm",
                "avcsn",
                "erwincas",
                "ofou",
                "luqman175",
                "brouwerg",
                "codejob",
                "YeeYee",
                "mroberto91",
                "datnguyen84",
                "Daisy1994",
                "brymcbride",
                "eramirez",
                "Qcriderfan87",
                "BenG",
                "11asds",
                "NicolasEberle",
                "rejsmont",
                "jordankab",
                "ShonzG",
                "rapidresponse",
                "feraco",
                "Girmeser",
                "emack0714",
                "_gone_cycling",
                "Motofarer",
                "mh",
                "dexter_m10",
                "Maxwell",
                "metheslayer",
                "shamam",
                "sillygwailo",
                "MaxDominic",
                "AllUp",
                "niklasfyi",
                "kicks66",
                "broses",
                "Pilate",
                "mmmmmmmm",
                "Fringe0387",
                "HASANICHAVEZ53",
                "sundawei",
                "comardelle67",
                "sunnyboat6168",
                "EmmaB",
                "nelochuck1999",
                "hehuajun",
                "he",
                "cy",
                "bkn2",
                "Bobo"
            ]
        }
    ]
}