Automatically check latest nuxt release and inform in CLI

[pi0]

Users could often miss the new releases. A globally cached manifest, can keep such information and warn in CLI (nicely!) to suggest upgrading to the latest available release using simple nuxi upgrade

I like to also extend it for important sub-dependencies such as Vue and Nitropackage (via lockfile) too but probably following up in next steps.

For now putting a pending label in this idea since working on CLI infra packages to make it a solid and better tested addition.