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kotlinlang

I don't know if this has been proposed before, I couldn't find an issue for it at least, but I would like to see `GeneratedSerializer` become public api. Or even better, I would like a public interface that provides the `childSerializers` and `typeParameterSerializers` methods, and `GeneratedSerializer` extend that interface and then it can serve as a purely marker interface. These methods are really useful in library development when dealing with serialization.

Example:
```public interface ExposedSerializer<T> : KSerializer<T> {
    public fun childSerializers(): Array<KSerializer<*>>
    public fun typeParametersSerializers(): Array<KSerializer<*>>
}

@InternalSerializationApi
public interface GeneratedSerializer<T> : ExposedSerializer<T> // Now just a marker interface```