Switch to type modules.

[mshima]

Related to #19113.

• change every test mts or mjs, keep mjs where there is too many unsafe type problems.
  Except jdl and cli tests, cli relies on proxyquire (commonjs only).
• rename commons files to cjs.
• change type to module at root package.json
• add package.json with type commonjs to jdl and test/jdl folders.
• move generator-base* to base/*
• move docker-* to base-docker/*
• use priority name from static fields. (Unambiguous Priorities #17132)

---

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.