PEX Implement evaluatePresentation

[EbonyLouis]

Reason

Currently in our docs we have a Verify Credentials Guide showing evalutePresentation however, we're only able to show it in JS. It'd be nice for us to have the functionality there for both JS and KT.

JS code for evaluatePresentation:

const evaluationResults = PresentationExchange.evaluatePresentation({
  presentationDefinition: presentationDefinition,
  presentation: presentationResult.presentation
});

Thanks 💖