Fix 'href-sanitizer' — performance issue

AdGuard 4.4.41
Scriptlets v1.12.1

### Details

https://hentai-id.tv/ uses URL shortener for analytics


Following rule removes redirection
`hentai-id.tv#%#//scriptlet('href-sanitizer', 'a[href*="://ouo.io/"]', '?s')`

Example
```
https://ouo.io/s/lbH3iXRW?s=https://hentai-id.tv/my-weekend-sex-buddy-my-female-boss-only-i-know-the-other-side-of-julia/
```
changed to
```
https://hentai-id.tv/my-weekend-sex-buddy-my-female-boss-only-i-know-the-other-side-of-julia/
```

### Problem details

I need to wait until the page will be loaded completely.
It can be reproduce with throttling as 3G using the DevTools.

Details


### Proposed solution

Probably mutation observer can be used to scan elements, or just scan every 0.5-1 second.