Simplify IPropertyValueConverter

[petrsvihlik]

Blocked by: #215

Motivation

Both Newtonsoft.Json and System.Text.Json support value converters. We could get rid of our custom implementation based on the IPropertyValueConverter. It would be one thing less to learn for the consumers of our SDK + we'd reduce the codebase.

Newtonsoft.Json

• JsonConverterAttribute for properties
  • JsonConverterAttribute for classes

System.Text.Json

• Registration sample - [JsonConverter] on a property
  • JsonConverterAttribute
  • JsonConverter<T> Class
  • JsonConverterFactory