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-191
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Content-Type: application/json
Expires: Wed, 08 Jul 2020 00:22:18 GMT
Vary: Accept

{
    "count": 48,
    "next": null,
    "previous": null,
    "results": [
        {
            "source": "direct-sharing-191",
            "name": "Fitbit Intraday",
            "usernames": [
                "madprime",
                "beau",
                "eramirez",
                "padams89",
                "gsdcomo",
                "rizley",
                "ranulimes",
                "gerwitz",
                "Hexaped",
                "Thunderbolt8000",
                "snyddogg",
                "mielghar",
                "kimhunter",
                "canaalex",
                "rbarker01",
                "idasim",
                "Nottingham",
                "afrendeiro",
                "ArloJamesBarnes",
                "gedankenstuecke",
                "MarciajsR",
                "davenation",
                "Gikady",
                "wpaul",
                "jameslvick",
                "hu1F73AB",
                "Dyfflinviking",
                "salbers12",
                "mheffler",
                "Pathocuria",
                "gbathree",
                "taximeow",
                "anildas",
                "darylfernandes",
                "Tornado14",
                "Agaricus",
                "ehoneycomb",
                "Konvpolto",
                "Amerijoe",
                "OGolly",
                "wonderracer",
                "saw2112",
                "ajmorin369",
                "dnlang86",
                "noelsarah",
                "silviadg",
                "rowingupstream",
                "jbagwell4797",
                "janomar57",
                "Itbk",
                "Horsesrunwild",
                "pinpindapinpin",
                "IonutMurariu",
                "atelepen",
                "vebaba",
                "bradly22",
                "stevekennedyuk",
                "AigleDeTartare",
                "rodmerrill",
                "gobha",
                "czarag00",
                "msbmsw",
                "dmaynard",
                "agalonsk",
                "mako",
                "mikazilla",
                "Cyndisuzz",
                "koenkas",
                "domesticyborg",
                "Coding_Lizard",
                "JayMalik",
                "fury",
                "AuriCrow",
                "Elcharles89",
                "stanley_reynolds",
                "v_papapanagiotou",
                "shnizzedy",
                "katewac",
                "cindyknott",
                "YuryKh",
                "jasteige",
                "Valeria",
                "Val",
                "hubert",
                "FrenchJim",
                "aabsinthium",
                "bshogeman",
                "Misnowolf77",
                "HosanaC",
                "R_jn",
                "sashili",
                "stephthegeek",
                "Valeria2",
                "micky",
                "CalinGG",
                "vladm",
                "davidjhall",
                "Henk_H",
                "Luxyr",
                "a_ka_es",
                "Kirkwood",
                "c3n47ur",
                "Detect",
                "thinkaboutit126",
                "RetroParks",
                "a2975667",
                "lordvoldemort126",
                "data_wrangler"
            ]
        }
    ]
}