feat: expose server resolved urls

[bluwy]

Description

Implements #8891

Expose devServer.resolvedUrls and previewServer.resolvedUrls.

This PR also removes a breaking change in Vite 3 where printUrls are async, now they are back as sync.

Additional context

This mostly refactors on how we resolve urls and print them.

Previously, printUrls handle the entire resolve and print flow. Now, we break it into two parts. Whenever the server starts/restarts, we resolve resolvedUrls. This usually happens in the listen() function which is async and we lend to avoid printUrls becoming async. Then, printUrls become a basic function that only reads resolvedUrls and prints it.

Not sure how to add tests to this, but works locally for me and for vite-plugin-qrcode.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[sapphi-red]

one nitpick but other than that LGTM
Thanks for the refactor 👍

[bluwy]

Pushed a commit to reset resolvedUrls when the dev server is closed. I didn't handle this for the preview server, as it's usually a "start-once" server (and it's coded that way), and the change is a bit tricky to implement.