그룹에 채널 생성

Method	URL
POST	/api/group/:groupId/channel/create

Request.Body

{
    "channelType": "meeting",
    "channelName": "회의실"
}

Response

{
    "name": "회의실",
    "group": {
        "id": 1,
        "createdAt": "2021-11-04T02:52:53.590Z",
        "updatedAt": "2021-11-04T02:52:53.590Z",
        "name": "hello",
        "code": "MzczNTg3",
        "thumbnail": null
    },
    "id": 4,
    "createdAt": "2021-11-04T04:10:06.033Z",
    "updatedAt": "2021-11-04T04:10:06.033Z"
}