feat: add web-vitals integration

[pi0]

Using web-vitals module for nuxt to collect web-vitals (currently FID, TTFB, LCP, CLS, FCP)

We can send events to either vercel analytics endpoint or google analytics (/cc @addyosmani which one you prefer?)

Also for vercel support, we are in contact with their team to integrate this module since just released vercel support for it.

[vercel]

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[addyosmani]

As we are using Vercel for hosting this might be a good opportunity to also try out how well their analytics solution works with CWV for Nuxt. I'd be supportive of Vercel here.

[pi0]

Hi @addyosmani. Today vercel team is announcing Vercel Analytics for Nuxt.js 🍾 I have enabled analytics feature in vercel config to try :)

Note: changes in this PR for adding vitals will not be necessary for end-users. I've added it to have more control for debugging for time being. Also we have liberty of changing vitals provider at any time.