Eliminate methods for Endpoints

[aidan-casey]

I would love to change the syntax slightly for endpoints on the client wrapper. I just need to figure out the right (performant) way to do this.

For example:

// This
$client->tickets()->findById(1);

// Becomes this
$client->tickets->findById(1);

I think it looks cleaner. The question just becomes whether it would have a performance impact to instantiate all 160 service classes on construct or if there is a better way to come at this with __get().

Also, it'd be a breaking change, so version 1.0.0 if we do this.