Support additional Serialization mechanisms

[radcortez]

For SVM native image, Java Serialization is not supported yet.

We can workaround this, by use SVM Substitute with a supported Serialization mechanism (Jsonb for instance).

Unfortunately, this still raises an issue of different behaviours between the JVM and SVM executions, plus if using a persistent repository the data serialization is incompatible.

Ideally, we could support different Serialization mechanisms in JBeret and pick which one to use with a configuration. You won't be able to change Serialization after the first execution with a persistent store, but at least it would allow you to keep consistency between the JVM and SVM.