Add simple publication workflow setup.

[atsushieno]

It would help you publishing the npm package from GitHub Actions so that you don't have to resort to local publication.

The latest npm is a bit tricky to set up authentication token as NPM_TOKEN secret variable (you might have to create a dangerous "skip two-factor-auth" access token once), but that would reduce "we might have some local obstacle" concern.

It is on: workflow_dispatch so you can explicitly run the task on the Actions page only when you want to make a release.

There are version bump helpers but I'm not sure if they work fine, so if you want uncomment them at your own risk :)

[kmturley]

Thanks, I keep meaning to set this up.

I have it setup in Open Audio Stack here, so might just use that: https://github.com/open-audio-stack/open-audio-stack-core/blob/main/.github/workflows/release.yml

[kmturley]

I added the feature with this PR:
#20

So will close this one!