GroupCreate(GroupCreate)

{
    "id": "string",
    "name": "Group name",
    "type": "group",
    "timestamp": 1675964377,
    "participants": [
        {
            "id": "string",
            "rank": "admin"
        }
    ],
    "name_at": 1675964377,
    "created_at": 1675964377,
    "created_by": "string",
    "unprocessed_participants": [
        "string"
    ]
}