Support generic SerializationCustomSerializer

[manosbatsis]

Currently implementations of SerializationCustomSerializer need to be specific about the target type, so i end up with e.g.

class AppleSerializer(): FruitCustomSerializer<Apple>(),
        SerializationCustomSerializer<Apple, JsonStringProxy<Apple>>
class OrangeSerializer(): FruitCustomSerializer<Orange>(),
        SerializationCustomSerializer<Orange, JsonStringProxy<Orange>>
// repeat for all fruit types

Instead, i would like to create a generic serializer or factory like

class FruitCustomSerializer<T: Fruit> : SerializationCustomSerializer<T, JsonStringProxy<T>> {
   

    override fun toProxy(obj: T): JsonStringProxy<T> {
        return JsonStringProxy(
                jsonString = FruitUtil.toJsonString(obj),
                targetType = obj.javaClass)
    }

    override fun fromProxy(proxy: JsonStringProxy<T>) : T {
        return FruitUtil.toFruit(proxy.jsonString, proxy.targetType)
    }

}

I suppose the API could be enhanced with a method for the serializer to report if it supports a concrete class etc.

[nargas-ritu]

Created CORDA-4191 for an internal review