Make OutputConstructorAttribute optional

[rosieks]

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Issue details

Make OutputConstructorAttribute mandatory only if there is more than one constructor. The goal is to make make it easy to use records with primary constructor like that:

[OutputType]
public record SomeOutput(string Value1, string Value2);

Right now such code throw exception like this:

System.InvalidOperationException: SomeOutput had [OutputTypeAttribute], but did not contain constructor marked with [OutputConstructorAttribute].

Affected area/feature

SDK / Serialization