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-251
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 01:30:19 GMT
Vary: Accept

{
    "count": 51,
    "next": null,
    "previous": null,
    "results": [
        {
            "source": "direct-sharing-251",
            "name": "Dash Genomics",
            "usernames": [
                "svemagie",
                "rssfed23",
                "stephenbrad",
                "saw2112",
                "kdgreis",
                "blackbearnh",
                "annallull",
                "michaljamrich",
                "taximeow",
                "acompton6761",
                "nkenney61",
                "awhallon",
                "ramonimo",
                "Mo1968",
                "medimikka",
                "bzolynas",
                "event15",
                "Tracid1649",
                "suner52",
                "toddandchom",
                "jsbrava",
                "bworsor222",
                "PetuniaWash",
                "rickycatto",
                "HASANICHAVEZ53",
                "MrsMags28",
                "ophie45",
                "MuMZie",
                "Noinden",
                "valgar",
                "bitsy",
                "Apriltimms85",
                "ashley5886",
                "Smithlo",
                "Fortin",
                "himartinez91",
                "Marie",
                "generic_user",
                "npkk75",
                "MxRemy",
                "Dianalynnsquest",
                "pallmallking",
                "Rainbows",
                "CatMargFras",
                "pmartin760",
                "mrshays44",
                "acCommesso81",
                "Meriahm",
                "disclaimer",
                "Ancestrynerdgirl",
                "KaleyWhite",
                "chantalb79",
                "Ina8680",
                "matfax",
                "vtauber",
                "usamapervaiz94",
                "Indigenous19",
                "Mellucyruby2",
                "Danielle0219",
                "emmas1",
                "bb",
                "naytahlee",
                "100ideas",
                "lgarza",
                "JM9801",
                "wildshrub",
                "popman83"
            ]
        }
    ]
}