Gets the list of all currencies for which Wix supports conversion.
The getAllCurrencies() function returns a Promise that resolves to an array of currencies.
The array lists all currencies for which Wix supports conversion and their symbols.
Note: The getAllCurrencies() function is different from siteSettings.getCurrencies() in that this function gets the complete list of all of the currencies that are supported on Wix sites.
The siteSettings.getCurrencies() function gets only the currencies that have been set for use in your site using the backend function siteSettings.setCurrencies().