Add a Sentry.Refit Sample

### Problem Statement

Refit is a populair library for making requests. If an exception occurs, only the Exception Message will be sent to Sentry. The Message is a very broad description (a 400 was received) without containing valuable information.
This information is stored in the Content part of the Exception. Unfortunately, Sentry does not send this.
So when a Refit Exception occurs, you won't know what exactly is causing this.


### Solution Brainstorm

As a temporary solution I add my own EventExceptionProcessor but it would be nice to have something like .CatchRefit() to handle this.