[mediaqueries] Lift <media-feature> parens to <media-in-parens> (#6806)

[cdoublev]

This PR applies 1af56e0 to MediaQueries 5. This commit was made 3 years ago, after initiating from MediaQueries 4.

Also, the railroad diagram of the updated syntax was not updated accordingly. This PR updates it in both levels of the spec.

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Without this change, a container size query will match <general-enclosed> and evaluate to unknown, unless it is specified in two ()-blocks, because <query-in-parens> (CSS Contain) produces ( <size-feature> ), and <size-feature> is defined as "the same as for a media feature: a feature name, a comparator, and a value". (Note that you do not always have a comparator, eg. orientation: portrait.)

Besides, I assume that media-progress(<media-feature>, ...) and container-progress(<size-feature>, ...) are supposed to accept/take a query without using a ()-block.