Add scss support for container-*

[Trinovantes]

Add scss highlight support for container-* properties and @container query. These are now supported on most modern browsers.

https://developer.mozilla.org/en-US/docs/Web/CSS/container#browser_compatibility

This currently gives scss(unknownProperties) warning:

article{
    container-type: inline-size;

    .grid{
        @container (min-width: 400px) {
            grid-template-columns: 1fr 1fr;
        }

        @container (min-width: 600px) {
            grid-template-columns: 1fr 1fr 1fr;
        }
    }
}

[aeschli]

duplicate of #170589