Stats: Headless compatibility

### Impacted plugin

Jetpack

### What

It would be nice to have a section that provides us with this script to integrate statistics or other services with our site

### How

We have developed a site using Wp headless but we do not see a way to continue using Jetpack stats with our new site developed with NuxtJs.

At the moment I was reading the plugin code to generate a basic integration but I don't know the code obtained would be good.

## Script generated by plugin

This code requires the blog ID, domain and post/page ID

https://stats.wp.com/e-202351.js

_stq = window._stq || [];
_stq.push([ 'view', {v:'ext',blog:'BLOG_ID',post:'POST_ID',tz:'-5',srv:'DOMAIN',j:'1:11.6.1'} ]);
_stq.push([ 'clickTrackerInit', 'BLOG_ID', 'POST_ID' ]);

Review Jetpack's existing statistics integration and the script at https://stats.wp.com/e-202351.js, focusing on how a headless NuxtJs site could provide the blog ID, domain, and post/page ID. Done means documenting or implementing a supported integration path for Jetpack Stats in a headless site.

Written by the indexing model from the issue text.