Built-in support for System.Exception serialization

[lfritz-seweurodrive]

There are several System. Types which are supported by this library.
I suggest adding compatibility for System.Exception as well - allowing easy transfer of Exception information using Nerdbank.MessagePack.

[AArnott]

I hear ya. Serializing exceptions is incredibly helpful. StreamJsonRpc adds exception serialization support for this and other serialization libraries.

It's tricky to include at the serializer level because there are important security policies to consider. System.Exception is bad for security when serializing. It includes untyped data, it's a recursive data structure, and there are an open set of derived types to consider when deserializing.

[AArnott]

I'm playing around with this now. No promises.

At the moment, I'm not exactly blocked but surprised to see more work would be required than I expected: eiriktsarpalis/PolyType#349

[lfritz-seweurodrive]

Exceptions are a complex nested type after all. But I love to see you considering adding support for it.
For my own use case, I have written a mapper as a workaround and just discarded most of the exception information - to be able transfer the most important information using your nuget package for now