Allow use of private `configs`

I would like to be able to use commitlint configs from private packages or repositories.

I believe this is not currently possible for the following reasons:
- Passing `NPM_TOKEN` environment variable through contexts or project configuration is not sufficient, because without [the `-E` switch](https://github.com/conventional-changelog/commitlint-orb/blob/main/src/scripts/lint.sh#L4), `sudo` drops environment variables.
- Even if `-E` switch was used, any `.npmrc` config present in the project would not be read.
- The orb doesn't allow overriding the executor or the docker image, so I cannot use an image which running as root such as `node:18.14`
- AFAICT `npm` doesn't allow passing `_authToken` on the CLI, meaning I cannot piggy-back the `configs` parameter to inject CLI options.
- I can't attach a workspace with `node_modules` where I would have previously installed the private package.
- I can't write a custom job re-using a command from the orb, because there are none.

I will gladly open a PR to address this, but I'd like to know what would be your favorite method of solving this.

Regards,