Refactor game event json serialization

[Garados007]

Currently, is all the serialization stuff hardcoded for each event handler method. It would be better and easier for future maintenance, if those is replaced with auto conversion.

1. Create a structure for each type we want to output.
2. Fill the structure with the necessary details.
3. Use JsonSerializer.Serialize(Utf8JsonWriter, ...) to serialize this object.
4. Use a json configuration with the following details:
   • kebab-case naming scheme
   • use code generation
   • enums as strings