checkBotPermission  
  inline fun Group.checkBotPermission(required: MemberPermission, crossinline lazyMessage: () -> String = {
        "Permission denied: required $required, got actual $botPermission for $bot in group $id"
    })
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要求 Bot 在这个群里的权限至少为 required, 否则抛出异常 PermissionDeniedException