Add package publishing workflow

[clemsos]

Description

Help streamline package build / publishing to npm - eventually using CI using yarn v2

note: to be rebased once #7581 is merged REBASED (was painful...)

[edit] just found out that lerna does not work with yarn v2 - but we dont need lerna after all lerna/lerna#2564

Issues

Fixes #7571

Checklist:

• 1 PR, 1 purpose: my Pull Request applies to a single purpose
• I have commented my code, particularly in hard-to-understand areas
• I have updated the docs to reflect my changes if applicable
• I have added tests (and stories for frontend components) that prove my fix is effective or that my feature works
• I have performed a self-review of my own code
• If my code involves visual changes, I am adding applicable screenshots to this thread

[julien51]

🧹

[julien51]

💯