Embedded configuration

We're now passing the main settings as named parameters to showGenesysUI() function.

As we add more features, the number of configuration options is going to grow.

Implement a Config class with settings for Embedded Genesys UI:

class Config {
   public apiUrl: string = 'https://api.sandbox.genesys-pgr.org';
   public clientId: string = 'clientid@genesys';
   public clientKey: string = 'changeme';
   public filter: object;
}

We will then call showGenesysUI like:

showGenesysUI(document.getElementById('genesys-container'), {
 apiUrl: 'https://...',
 clientId: '..',
 ...
});