Configurable throwable serialization

[HaloFour]

Refactors the serialization of Throwable instances into an interface to allow formatter/layout projects to offer configuration options for how the exception is serialized.

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💚 CLA has been signed

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• Reason: The PR is not allowed to run in the CI yet

• Start Time: 2021-12-31T10:31:20.659+0000

• Duration: 3 min 10 sec

• Commit: 35f75ec

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[felixbarny]

The approach looks really good!

[HaloFour]

I'm going to attempt to put some more effort into this PR in the next few weeks. I'm trying to reconcile whether it's worthwhile to have a consistent way to format the exception or if it's something that should be delegated to whatever logging library is being used, e.g. throwable patterns in log4j2.

[HaloFour]

Closing in favor of #177