JPA static metamodel / Jakarta Data tests, dependency management and documentation

[yrodiere]

Description

We currently don't have guidance regarding the use of the JPA static metamodel or Jakarta Data in Quarkus.

Ultimately we will want to handle Jakarta Data in Panache and provide an integrated developer experience, but:

1. This will require Panache 2, which still requires some time before it can get out.
2. Some people will not be using Panache anyway.

So, let's:

• Add dependency management for Jakarta Data dependencies, aligned on whatever Hibernate ORM requires/implements
• Document how to use the JPA static metamodel and Jakarta Data in Quarkus. In particular Jakarta Data requires an additional runtime dependency.
• Document known limitations. In particular, I suspect the annotation processor won't work great in dev mode, at least in Gradle -- I think @FroMage made it work with Maven, at least.
• Add integration tests.
• Perhaps, add a quickstart.

Implementation ideas

No response

[quarkus-bot]

/cc @DavideD (hibernate-reactive), @gavinking (hibernate-reactive), @gsmet (hibernate-orm,jakarta)

[maxandersen]

related to #35603

[FroMage]

I suspect the annotation processor won't work great in dev mode, at least in Gradle -- I think @FroMage made it work with Maven, at least.

I also added support for Gradle a while ago so we're good :)

[yrodiere]

We will need to think about dependency management for Jakarta Data as well.