[FEAT]: Discriminated union support

[JamieMagee]

Describe the need

There are quite a few types that are discriminated unions. See #178 for an example of one. Currently we sidestep the issue by deserializing to dynamic and letting the SDK consumer figure out what the actual type is.

Discriminated unions aren't likely to make it into C# in the near future¹ (and I'm not likely to rewrite this SDK in F#). The only viable alternative I see right now is OneOf. However, the System.Text.Json story doesn't seem to be fully fleshed out.

SDK Version

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API Version

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Relevant log output

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Code of Conduct

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Footnotes

1. https://github.com/dotnet/csharplang/issues/113 ↩

[JamieMagee]

Another potential avenue: https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/polymorphism

[github-actions]

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