Enhancements

[LAGGOUNE-Walid]

Hello there, on this PR i added :

• Support for PHP8 type checking for parameters and for methods return.
• Support for PSR-1 and PSR-2 .
• Validator library installed and used to validate configurations rules , instead of traditionally "if else ".
• New configurations dynamic resolver (based on laravel string helper and __call magic method) (not create a getter for each config).
• Basic and simple tests added .

i eddited :

• Some method are rewritten to be simple .
• Moved validation of configuration to when initial create Chargily object.

[ChargilyDev]

Verified, thank you

[LAGGOUNE-Walid]

Hello, please try&test Webhook functionalities. I couldn't test it .

I wish if there any sandbox to test all functionalities from payment to response.