Fix shopify extension commands timeout when organization has too many apps

[karreiro]

WHY are these changes introduced?

When users run shopify extension commands, and the organization has too many apps (~ 100), they're facing timeout issues:

WHAT is this pull request doing?

Eager loading extensionRegistrations with all_orgs_with_extensions.graphql takes too long for organizations with a large number of apps.

I've initially considered paginating this query to avoid timeouts, but users would still need to wait too long.

So, this PR changes the ShopifyCLI::PartnersAPI::Organizations.fetch_with_extensions method to fetch extensionRegistrations individually and in parallel.

For a small number of apps, this change has almost no impact. But, for many apps (> 40), it gets expressive faster results:

Also, this PR introduces a spinner in the "Loading your extensions…" message.

How to test your changes?

Run shopify extension connect and notice the timeout won't happen anymore*:

It takes some time to fetch 100 apps, so the Gif above demonstrates the command with 3 items. I've double-checked the mechanism locally with more than 100 apps, and I've not faced timeout issues.

Post-release steps

None.

Update checklist

• I've added a CHANGELOG entry for this PR (if the change is public-facing)
• I've considered possible cross-platform impacts (Mac, Linux, Windows).
• I've left the version number as is (we'll handle incrementing this when releasing).
• I've included any post-release steps in the section above.

[karreiro]

Thank you for the review and the suggestions, @catlee! 🚀

I've gone through all comments, and I believe we now have a more robust mechanism. Please, let me know what do you think :)

[catlee]

Much better, thanks for fixing this up!

[pepicrft]

This is awesome @karreiro and that pattern that you introduced will be useful in other places. I'll be OOO from tomorrow (Friday) so I won't be able to see the answers to my comments. Don't let them block you, if you disagree with some you can go ahead and merge and we can talk about them in January. Again, amazing!

[karreiro]

Thanks a lot for the review, @pepicrft!

I've applied the fixes for most comments in a new commit. Also, don't hesitate to ping me in January if I've missed something 😊