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-453
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Content-Type: application/json
Expires: Fri, 19 Aug 2022 02:20:24 GMT
Vary: Accept

{
    "count": 51,
    "next": null,
    "previous": null,
    "results": [
        {
            "source": "direct-sharing-453",
            "name": "OH Data Port for Apple Health",
            "usernames": [
                "Craig997uk",
                "Sergey07",
                "Laghustoka",
                "Pojo",
                "m4p",
                "Jarvis532",
                "glenlubbert",
                "bst_b_well",
                "Laiudi",
                "devnull",
                "jbedell",
                "lbaldy",
                "Iain",
                "onyame",
                "sprague",
                "yelo",
                "ratibrenrian",
                "amcarlis",
                "volta1",
                "Kate48230",
                "madprime",
                "Iwynne",
                "Al70",
                "jsteuer",
                "scottleibrand",
                "Lizzie180",
                "austospumanto",
                "Clee",
                "rwmurphy",
                "ycliu",
                "uxgreg",
                "medimikka",
                "UnstrungHero",
                "Guillaume",
                "Jtiger1990",
                "fabianoserfaty",
                "ldorigo",
                "MarcelZ",
                "Dawnellenf",
                "fivetwentyseven",
                "SoniaG",
                "Matilda444",
                "Tooraj",
                "gedankenstuecke",
                "katielorrie",
                "Faithiep",
                "Briskman",
                "disclaimer",
                "Whoisdsmith",
                "jasteige",
                "Pavelee",
                "kelseycannici",
                "Lascd001",
                "Maorine",
                "tracker232",
                "ehlen",
                "gsdcomo",
                "Chrisitan_Walter",
                "oguzhanogreden",
                "MuhammadAhnad",
                "medicfurby",
                "Misnowolf77",
                "katewac",
                "SGrannis",
                "Peony",
                "Sebastian405",
                "Nickanyan",
                "jesse",
                "DidierC",
                "padams89",
                "jenicarvalho",
                "msimcox2",
                "andyduk",
                "Explore360",
                "PutMeInAZoo",
                "Kchalley78",
                "M_hughes"
            ]
        }
    ]
}