--extract-enums for generateApi

Hi, dear developer of swagger-typescript-api
It's really so usefull package, that let you write the best practice code, and have a little TS problems!

I would ask you to add `--extract-enums` param to `generateApi`, because I can't use CLI, I need hooks
Please, let it possible

import { generateApi } from 'swagger-typescript-api';

generateApi({
...
extractEnums: true,
})