Support for style queries

Unless I'm missing it, it appears this polyfill lacks the newer style query definition. This is essential to some of my use cases for container queries.

```css
@container style(font-weight: bold) {
color: black;
}
```

Start by reviewing the polyfill’s current container-query support against the `@container style(font-weight: bold)` example. Confirm the expected behavior with a focused test or reproduction, and consider the work done when style queries are accepted and apply the shown color rule.

Written by the indexing model from the issue text.