defaultFeatureMessageJsonConfig    
  Provides a preconfigured instance of Json with specific settings tailored for serializing and deserializing feature messages in a remote communication context.
This configuration includes features such as
Enabling pretty printing of JSON for readability.
Ignoring unknown keys during deserialization to support backward and forward compatibility.
Encoding default values to ensure complete serialization of data.
Allowing lenient parsing for more flexible input handling.
Disabling explicit null representation to omit
nullfields when serializing.
Additionally, this Json instance is configured with a default serializers module, facilitating custom serialization logic for feature messages.