Notify sentry when we get a SyntaxError

[tomsaleeba]

This is for clients who have older browsers. The trick is that we need to get our config items which are in the bundle that we can't load. We might be able to use rollup to create a separate bundle, including config and sentry, that we can (not precache) load only in the failure case and then report the error.

This is really only for analytics so we can see how many users we're missing.