Added support for container query

[Yakubko]

Previous Behavior

All container query styles are ignored.

New Behavior

CSS Container query is supported. It is implemented in a similar way as support for @supports query All container styles are added to the extra Sheet which is located between regular and media styles.

[Yakubko]

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[layershifter]

Note for myself: felaStylisEnhancer.ts works with declarations, not on the whole rule:

So @container changes don't affect prefixing.

[github-actions]

Pull request demo site: URL