Improve handling of inner classes

[Laurens-W]

What's changed?

Improved handling of inner classes

What's your motivation?

https://rewriteoss.slack.com/archives/C01A843MWG5/p1725947336140549

Anything in particular you'd like reviewers to focus on?

Anyone you would like to review specifically?

@timtebeek

Have you considered any alternatives or workarounds?

Any additional context

Checklist

• I've added unit tests to cover both positive and negative cases
• I've read and applied the recipe conventions and best practices
• I've used the IntelliJ IDEA auto-formatter on affected files

[Laurens-W]

Running it against OR using the cli no longer gives any problematic changesets, currently running a different recipe against Spring but can do this one too after that