Migrate `RestRequest` to PSR-7 Messages

[R3VoLuT1OneR]

Current implementation using Symfony HttpFoundation requests. But if we want our code to match PHP standards we must migrate to PSR-7 HTTP messages.

https://www.php-fig.org/psr/psr-7/

Should look and decide which libraries are best fit for this package: https://github.com/guzzle/psr7 https://github.com/Nyholm/psr7 https://github.com/laminas/laminas-diactoros