Support non-Eloquent resource

[maartenpaauw]

Description

Add initial support for non-Eloquent resources

Motivation and context

Laravel JSON:API offers support for non-Eloquent resources. This PR add initial support for non-Eloquent resources.

It isn't flawless because, the entity under the hood needs to implement ArrayAccess and have static all method (which is needed to generate examples). But it's a good start.

How has this been tested?

Tests are green and the JSON file is generating.

Screenshots (if appropriate)

Types of changes

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• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

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[Rocksheep]

Hi @maartenpaauw ,

Thank you for the PR. The code looks good, but could you add tests to prove that the code works?

[maartenpaauw]

The project where we use this package has been postponed. As a result, I haven't had time to write tests yet.

[Rocksheep]

Ah alright. For now I've merged this into a separate branch and I'm expanding on it to include some tests. Thank you for your contribution 😄