The Json Serialization currently doesn't support AZStd::any, AZStd::variant and AZStd::optional due to various JSON formatting concerns. This wasn't properly reported resulting in confusion about whether the missing functionality is intentional or a bug. This change makes this explicit with an error message.
As this solution uses a custom json serializer to report the issue, an option was added so it's possible to overwrite a serializer for a specific type.
This doesn't mean that the three listed types will never be supported. If/when a suitable format is found an implementation will be added.
AMZN-koppersr
dba1832821