Add a new argument for a few scriptlets to run at specific readyState timing

So now I realized AdGuard scriptlets don't have `runAt` option available for some uBO scriptlets such as `aeld`, (trusted-)`set`, and now `trusted-create-html`. This has been useful in some cases, now for example `pvpoke-re[.]com` who has removed iframes I created by `trusted-create-element` to defuse anti-adblock. If `trusted-create-element` can run at the `load` timing, the site can't simply remove iframes as doing so will also remove real ad frames.
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To be celar, AdGuard is not detected as of writing, as I added a bit different rule to Base. But the suggestion here will be anyway useful.