Sentry implementation of `IExceptionHandler`

[jamescrosswell]

.NET 8 adds an IExceptionHandler interface. One of the things the ProblemDetails format allows for is an instance:

"instance": "(string) - A URI reference that identifies the specific occurrence of the problem. It may or may not yield further information if dereferenced."

We could potentially create a Sentry IExceptionHandler that returns a deep link to the error that gets captured in Sentry. Not sure if there's any desire/apetite from customers for such a beast. Probably of most use in DEBUG.