improvements to addJavaAnnotation

[mshima]

• implement addJavaImport
• add parameters support to addJavaAnnotation
• implement callbacks for editFile editFile('Foo.java', addJavaImport('package.Class'))

---

Please make sure the below checklist is followed for Pull Requests.

• [ ] All continuous integration tests are green
• [ ] Tests are added where necessary
• [ ] The JDL part is updated if necessary
• [ ] jhipster-online is updated if necessary
• [ ] Documentation is added/updated where necessary
• [ ] Coding Rules & Commit Guidelines as per our CONTRIBUTING.md document are followed

When you are still working on the PR, consider converting it to Draft (below reviewers) and adding skip-ci label, you can still see CI build result at your branch.