Snapshot-based content change assertion

[ovflowd]

Enter your suggestions in details:

This would be an important feature to ensure that:

1. We have baseline:

• The baseline gets automatically updated on every time a new commit happens on nodejs/node via GHA
• We can also get notified maybe if the baseline changes too much? Which could flag peerDep change issues or some massive content change upstream?

2. On every PR it runs a CI that runs all generators and stores snapshots of them (same as happens on main` except that it doesn't override the baseline files)

• It compares against the baseline and "cries"/fails if the content changed
• This would allow us to verify easily and seamlessly if changes in PR are affecting content generation
• The failure could be rendered as a git diff between these two files

cc @nodejs/web-infra

[avivkeller]

We already upload an artifact on each commit here, so we can use that as a comparison in PRs to this repo?

[ovflowd]

Makes sense :)