Add support for editing messages with Limelight, where possible

[AllegroFox]

Uses window.postMessage to send message JSON to Limelight, allowing us to handle more message data than we can by encoding a URL. (github.io will truncate URLs after a certain length, which almost all of our messages exceed.)

So far I've only enabled this for Spotlights and Infobars in the production table, as these are the types of messages that Limelight currently knows about. We can incrementally add support for more templates to Limelight and add those templates to the SupportedTypes array, similarly to how we did for message preview.

Unfortunately window.postMessage requires exact URLs in order to work, so we won't be able to see this working in the deploy preview. I've tested it extensively locally though, and we can always just remove the links from the table if there are issues after landing.

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[dmose]

When I try to run this branch locally, I see this:

[AllegroFox]

@dmose Is it possible you've got some malformed JSON on your local? I'm only able to trigger that if I do something like remove the screens array from a message, or put a "spotlight" template on something that isn't a spotlight fr. ex.
I can wrap this function in a try/catch or something so that messages with wonky JSON don't generate edit links :)