fix(analytics): make logging low priority

[AmitMY]

fixes #2634

Source for fix: https://developers.google.com/web/updates/2019/02/priority-hints

Deprioritizing fetches

This may not be a common scenario, but it can happen in modern applications: Let's say you have a high volume of fetch calls that fire around the same time. Because fetches are given high priority, they'll contend with one another (and other high priority requests) if enough of them occur in the same space of time. What you could do in this scenario is set an importance of low on fetches for non-critical data:

// Important user data (high by default)
let userData = await fetch("/user");

// Less important content data (explicitly low)
let newsFeedContent = await fetch("/content/news-feed", {importance: "low"});
let suggestedContent = await fetch("/content/suggested", {importance: "low"});

This approach ensures that fetches for critical data won't contend with other fetches for less important data. This could potentially improve performance in some scenarios, particularly where bandwidth is low, and the number of fetch calls is high.