Add Eloquent casts

[Propaganistas]

Here's another PR implementing Eloquent cast classes, supporting the newly introduced config sets as well.

Note that custom cast classes were implemented as of Laravel 7, so I've dropped support below that version.

Note2: the GitHub actions workflow doesn't check Laravel 9?

[stevebauman]

Excellent, thanks @Propaganistas! Appreciate your work ❤️

[stevebauman]

Note that custom cast classes were implemented as of Laravel 7, so I've dropped support below that version.

That's fine with me 👍

Note2: the GitHub actions workflow doesn't check Laravel 9?

I've just pushed an update to the actions workflow to add Laravel 9 into the test matrix 👍

[stevebauman]

@Propaganistas I've just released v5.0 with your PR's included:

https://github.com/stevebauman/purify/releases/tag/v5.0.0

Thank you again for your hard work.