Issue-430 - Add shared node setup / module cache

[huntharo]

Summary

• Saves 3 seconds per build
• Partial for [Feature] Publish typedoc docs #430

Before

• 0 seconds to setup node 16
• 7 seconds to install modules from scratch
• Repeated on every build

https://github.com/ekalinin/sitemap.js/actions/runs/9183238710/job/25253577373

After

• 4 seconds to restore modules from cache

https://github.com/ekalinin/sitemap.js/actions/runs/9184692506/job/25257439376

[huntharo]

@derduher this is ready for review. It helps with the next thing I'm going to do in #430 which is to add a job to publish the docs. It will be a benefit to have the node install / deps install / cache restore code consolidated for that.