GroupRequestEvent(申请加群)

{
    "time": 1640995200,
    "self_id": 123456789,
    "post_type": "request",
    "request_type": "group",
    "sub_type": "add",
    "comment": "string",
    "flag": "string",
    "group_id": 0,
    "user_id": 0,
    "invitor_id": 0,
    "source_group_id": 0
}