Switch to using javascript objects as configuration with ESM

Switching to a JavaScript object as configuration object for prettier allows overriding the predefined rules. This also helps with the issue to override the typescript version for various plugins when different typescript versions are used in the project.
The package should use ESM to export the configuration object.

We need to make sure that the tooling using Prettier is compatible with ESM as well. We had issues with ESM imports not working inside `.prettierrc.js` in the past.