Handle underlyingError property from NSError

[brustolin]

Description

We should add the underlyingError of an NSError to the event exception list as defined by the documentation.

[github-actions]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[armcknight]

I have a first pass at a solution in #3230, but i'm not sure if they're being serialized the right way. Reading the docs, it's not clear to me where they should go and there is no example.

[philipphofmann]

Fixed with #3230.