feat(error-tracking): support custom properties

[MunifTanjim]

[orian]

Can you add a test checkin that marshaled message didn't change? Also, we need to add proper changelog entry, it's a breaking change

[MunifTanjim]

Can you add a test checkin that marshaled message didn't change?

I'm not sure how to write that test. Is there any similar existing tests? The whole existing test suite is passing with the change tho.

Also, we need to add proper changelog entry, it's a breaking change

Should I modify CHANGELOG.md file in this PR? Or would that be written before releasing?

[jonathanlab]

Thanks a lot for raising the issue + your PR!

We're going to continue work on this feature in this PR. It also adds tests + support for passing properties to NewDefaultException. Would love your eyes on it as well to see if it's what you're looking for.