Optional CodeFormatter

[offbeatful]

Thank you for the awesome library!

It would be even better if formatting comes optional. Reasons:

1. Not all of us use Prettier
2. Sometimes I just want to disable formatting at all.
3. Performance (in my tests it is 358ms vs 60ms without formatting) on petstore swagger

Ideally I want to pass my own instance of CodeFormatter or null.

[smorimoto]

Now the performance improvements have been made by replacing Prettier with Biome, and disabling the formatter is an option worth exploring, but is not a high priority at the moment.

[offbeatful]

Thank you!