Explicit rendering flag about rendertron HOT 3 CLOSED

As discussed in #48, there are some issues with fully relying on network idle time (as far as I understand how it works).

To trigger of some other stuff in our application (setting meta tags, etc.) we're currently dispatching a custom event in the router we're using. It might be a good idea if we could incorporate a new event that notifies the bot renderer the page is 'good enough' to be send, even though not all custom elements are fully loaded in terms of data (video's not fully downloaded, non important async stuff).

this.dispatchEvent(new CustomEvent('page-loaded', { bubbles: true, composed: true } }));

Maybe this isn't the way to go an a better heuristic might be a better idea to keep the bot renderer dependency free (although it already isn't with the custom status codes).

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I like the event - I would make a slight change to Event instead of a CustomEvent.

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@samuelli Really cool!

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