Preparing Jinq 2.0

[Jinq]

Although Jinq is currently being maintained with minimal updates, it does need to evolve with the changing Java ecosystem. I've prepared a future 2.0 release that bundles up a few small changes to Jinq that may break compatibility with previous code. The main changes are

- Moving from the J2EE javax.persistence namespace to the Jakarta EE jakarta.persistence namespace

- Adding proper module support

I have started to update the documentation about these changes. I don't think anyone needs these changes at the moment, so I haven't released this 2.0 version yet in case there any other compatibility-breaking changes that need to be added too.