chore: update Yarn to v4; migrate from Lerna to Yarn Workspaces

[wojtekmaj]

This is an experimental PR to see the potential effect of upgrading Yarn to v4.

Why not Yarn v1:

• It's no longer maintained.
• It has many known bugs.
• It's far slower than virtually every modern competitor (including npm).

Why Yarn v4:

• Fast.
• Very easy, pretty much automatic upgrade.
• Bulit-in workspaces, allowing us to drop Lerna and has all its features built-in.
• Automatic dependency management ("workspace:" protocol) - changes to ^x.x.x where x.x.x is the latest dependency version at the moment of publishing
• Built-in portable shell, allowing us to use e.g. environment variables in scripts, and it'll work on Windows too.

What would make this PR ready for review

• Publishing process - I don't see why it wouldn't work, but I also cannot test it
• Analyzing dependency tree; would running builds in parallel be okay? If so, we can shave off additional 6 seconds from each build.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 5b575dc

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[wojtekmaj]

@diegomura I'd love to know what you think about this!

[diegomura]

I like this!

[wojtekmaj]

I'm glad! Rebased. Working for me.
I don't understand 100% of your workflow though, so I would really appreciate if you could play around with it and see if everything behaves 100% like you expect.

[diegomura]

@wojtekmaj this needs rebase 😄 Sorry, lots of changes going on recently

[wojtekmaj]

lots of changes going on recently

I wonder who can be at fault 🤣 Done.

Just to be sure though, @diegomura did you find some time it works alright and doesn't disrupt your workflow?

I'm more than happy to address any feedback you might have, and this IS a big change!

[wojtekmaj]

Regarding publishing process - my biggest worry was about how version descriptors are managed during publish. Now Yarn handles automatically what Changesets used to do - so we use workspace:^ version descriptors that gets swapped to latest patch version on publish. This seems to be handled well since changesets/changesets#585 so we should be okay!