Chore: automatically publish the npm package when the version is updated

[katspaugh]

Description

This PR adds a GitHub action to publish on NPM.
When the version in package.json is updated and pushed to main, this action adds a git tag and publishes the package.

[github-actions]

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[DaniSomoza]

Approved! :D

[mmv08]

It'd be great also to have automated GitHub releases/changelogs. For the apps SDK, we use https://github.com/atlassian/changesets, and so far, it's good