Allow serialized properties to be sorted alphabetically

[chrisparton1991]

Feature description

Jackson has a setting that will output fields in alphabetical order, which can be enabled through Micronaut (when using Jackson) via jackson.deserialization.sort-properties-alphabetically=true.

I store JSON documents as regression test snapshots, and sorting properties alphabetically makes the documents more stable.

My workaround for the time being will be to take the JSON produced by Serde and run it back through Jackson in my tests to sort the properties.