Create a Sentry account for catching JavaScript errors

[cvan]

Collect JavaScript errors (call stacks and anonymous browser/platform information) anonymously (no PII) using Sentry so we (Unity WebVR Assets project maintainers) can track errors occuring from usage in the wild.

In the script added, we'll be sure to exclude traffic from localhost, ngrok, localtunnel, non-HTTPS origins.

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Sentry (https://sentry.io/) is a free service (with optional paid-tier plans) used to catch JavaScript application errors (i.e., uncaught, console, and explicitly submitted).

It's compatible with every programming language, its most popular being its open-source, in-browser JavaScript client called Raven.js (https://github.com/getsentry/raven-js).

I used Sentry for a good 4+ years on the high-traffic Mozilla Add-ons site (https://addons.mozilla.org/, the Firefox Marketplace (https://marketplace.firefox.com; former app store for Firefox [OS and desktop] Open Web Apps), the Mozilla MR Social client (https://github.com/mozilla/mr-social-client/blob/master/src/telemetry.js), and many more Mozilla projects.

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Parent issue: #165
Related issues: #164 for documentation/messaging

[cvan]

Created https://sentry.io/mozilla-mixed-reality-xe/unity-webxr-assets/. Ask @cvan privately if you want to know how to get access (and know which email address it's tied to).

And I enabled all the options in the Security & Privacy settings 🔒 to limit the PII:

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• https://sentry.io/mozilla-mixed-reality-xe/unity-webxr-assets/
• https://sentry.io/organizations/mozilla-mixed-reality-xe/teams/your-teams/

If you'd like access (from your own @mozilla.com email address), sign up for an account on https://sentry.io/, and contact me by email or Slack.

(P.S. If you're using Raven.js for other projects, check out this neat page for generating URLs to the CDN builds of the library: https://ravenjs.com/)