[CHORE] Add Github publish action

[sbarrio]

What does this PR do?

This PR introduces a Github action that will allow us to publish the SDK package to NPM.

Motivation

This process should be automated and hosted on Github.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)
• If this PR is auto-generated, please make sure also to manually update the code related to the change