Create GPT-3 Complete Laravel Facade

[gregpriday]

Create a simple GPT-3 completions Facade for Laravel. This should include a service provider and a config file to set an OpenAI key, as well as default values.

This would work something like follows

use SiteOrigin\LaravelOpenAI\Facades\GPT3Complete;

GPT3Complete::withOptions(['temperature' => 0.7])->complete("I think, therefor I");

We'll obviously need a service class and a service provider to go along with this.