Get a list of dialable countries in Amazon Connect Agent Workspace
 Get a list of DialableCountry that contains the country code and
                calling code that the Amazon Connect instance is allowed to make calls to. 
Signature
listDialableCountries(): Promise<DialableCountry[]>
Usage
const dialableCountries:DialableCountry[] = await voiceClient.listDialableCountries();
Output - DialableCountry
| Parameter | Type | Description | 
|---|---|---|
| countryCode | string | The ISO country code | 
| callingCode | string | The calling code for the country | 
| label | string | The name of the country | 
Permissions required:
User.Configuration.View