Track new JavaPoet group and package name

[squarejesse]

Rename the existing interop module to javapoet-deprecated and introduce a new module called javapoet that integrates with the Palantir JavaPoet fork.

• docs/changelog.md has been updated if applicable.

[squarejesse]

The original integration is still around because I don’t want to break backwards compatibility. That’s especially important for projects like this one that might coexist on a Gradle build classpath with very old and very new code.

[JakeWharton]

The old implementation was never marked as stable, but at least the JavaPoet APIs behind it were stable. These new APIs are also not marked as stable, but the Palantir fork of JavaPoet is itself not stable either.

Do we even expect anyone to use this? The only project in the entire world using the old artifact is https://github.com/zlataovce/takenaka. I'm not sure I would bother until people start asking for this, which I'm not sure anyone ever would.

[squarejesse]

I hadn’t even considered that this wasn’t used. Doubling up on dead code certainly feels like a waste.

I’ll close this. We can consider dropping the old integration completely.