UUID instead of an auto-increment integer for ID with Active Record

Comparing #17 with #19

Content

> I have a dream ... > I am happy to join with you today in what will go down in history as the greatest demonstration of

bad design of Active Record.

I have an API. It's built with a RESTful extension over Active Record, and some endpoints provide PUT methods to upload files. By a REST design we create an entity with `POST /video` first, and then upload a video file with `PUT /video/{id}/data`.

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P.S. A couple of helper functions.

```php
declare(strict_types=1);

namespace common\helpers;

[...]