CallKitのネイティブ通話UIの通話を追加をdisableにする
// CXProviderConfigurationの設定
let providerConfiguration = CXProviderConfiguration(localizedName: localizedName)
providerConfiguration.maximumCallGroups = 1
providerConfiguration.maximumCallsPerCallGroup = 1
// CXCallUpdateの設定
let update = CXCallUpdate()
update.supportsUngrouping = false
update.supportsGrouping = false
update.supportsHolding = false