Adds Stringable interface to all classes containing __toString() method. #620
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Since this project now requires a minimum PHP version of 8.1, PHP 8.0 introduced a new interface called Stringable which we are able to explicitly implement.
As the excerpt from the linked docs states above, although any class implementing
__toString()will automatically gain the Stringable interface, it can and should be declared explicitly (presumably for future versions of PHP, and IDE help etc).This PR implements Stringable to all classes implementing the
__toString()method.