Extract annotations into own package #1641 follow up

[trejjam]

Move JsonInheritanceAttribute into Annotations package

[trejjam]

If you do not find it useful, just close it

[RicoSuter]

The problem is that in your model you’d also need the converter in the base class. This would lead to a dep to STJ in annotations.. also newtonsoft would then need the same move into NJS.NewtonsoftJson.Annotations

[RicoSuter]

Btw with net7 you dont need these anymore
https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/polymorphism?pivots=dotnet-7-0

[trejjam]

I know that I personally do not need them. I just saw an attribute when I was searching about JsonConvertor<>. And this is the result.

I had in my mind that NJS.NewtonsoftJson.Annotations and NJS.SystemTextJson.Annotations might appear in the future. I do not think I need them now, but I am willing to prepare PR, so they will exist in the stable 11 release.

[trejjam]

I did not know that NewtonsoftJson has its own JsonInheritanceAttribute in NJsonSchema.NewtonsoftJson.Converters. It makes this PR useless

[RicoSuter]

The plan is that the default packages will eventually be stj only and newtonsoft lives in additional packges for legacy