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-184
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Content-Type: application/json
Expires: Wed, 23 Sep 2020 05:27:18 GMT
Vary: Accept

{
    "count": 50,
    "next": null,
    "previous": null,
    "results": [
        {
            "source": "direct-sharing-184",
            "name": "Oura Connect",
            "usernames": [
                "madprime",
                "kaneary",
                "Dan",
                "microlytic",
                "awz",
                "ArloJamesBarnes",
                "gedankenstuecke",
                "jongchul",
                "wzwaag",
                "wpaul",
                "mariemon",
                "jdflaten",
                "joelklee",
                "Jonestj2",
                "taximeow",
                "pfinney40",
                "jrandymac",
                "heini",
                "monicaaj",
                "scottleibrand",
                "Athina",
                "tchaber",
                "marissamiller57",
                "pdehaye",
                "kdgreis",
                "bdaqueen",
                "azuredominique",
                "mako",
                "Coding_Lizard",
                "jsamsoondar",
                "JeniferLynnGarrett",
                "M_P",
                "bsoule",
                "mlukaczyk",
                "JohnGriffiths",
                "jsuew",
                "kwilst",
                "teresaeg",
                "carricoach",
                "soundinspace",
                "maggied",
                "weboesel",
                "musecycles",
                "josiegrant",
                "sarablenk",
                "jhs74",
                "S_IllerDrachman",
                "hagarrett",
                "katewac",
                "racergirl76",
                "beorn",
                "mw_pw",
                "ouzor",
                "vvladescu",
                "lsmarr",
                "Ascendant",
                "tyler_gemini",
                "hotmasu",
                "dyldahl",
                "juliusretzer",
                "glebkalinin",
                "jjruescas",
                "svemagie",
                "Misnowolf77",
                "TJHolland",
                "jyork",
                "apollo66",
                "andriusbug",
                "OpenHuman123",
                "tedwyer1",
                "alexcr",
                "Blackunicorn",
                "synteny",
                "zwtx",
                "bence",
                "cheezerman",
                "dmlh",
                "Teal",
                "dimetschis",
                "erb",
                "anne_matri",
                "safexharbour",
                "bk_nyc",
                "medimikka",
                "jimzim",
                "glenlubbert",
                "scg217",
                "Newshoes1",
                "cudge_usa",
                "cdickinson"
            ]
        }
    ]
}