BasicType registrations for generic JSON types

[beikov]

Add BasicType registrations for some generic JSON types:

• com.fasterxml.jackson.databind.JsonNode
• jakarta.json.JsonValue

We would only add these type registrations when the respective JSON library is available on the classpath. The main motivation for this is to allow easy access to JSON data for native queries. People can then use e.g. NativeQuery.addScalar(..., JsonObject.class) to retrieve a Json parsed value directly.

A possible alternative to this could be that we add addScalar overloads that additionally accept a SqlTypes code, which would allow us to resolve the proper JdbcType and construct the correct BasicType. This solution would be more flexible and future proof.

Related to the discussion is the JPA feature request: jakartaee/persistence#343

Thoughts?