Initialise call by ARN

[Juzziee]

Recently, we have been working on implementing a way to directly call another agent / queue / contact flow from a fresh contact.
A way to intialise an endpoint by its ARN (gathered from the SearchUser or SearchQueue api) would be fantastic.

This would allow a call center to implement communication across teams without having to utiliies DTMF and storing data in a cache or database.

This could be added to the agent.connect function.

`var endpoint = connect.Endpoint.byArn("arn:*******");
var agent = new connect.Agent();
var queueArn = "arn:aws:connect::<ACCOUNT_ID>:instance/<CONNECT_INSTANCE_ID>/queue/<CONNECT_QUEUE_ID>";

agent.connect(endpoint, {
queueARN: queueArn,
success: function() { console.log("outbound call connected"); },
failure: function(err) {
console.log("outbound call connection failed");
console.log(err);
}
});`