Support container query length units

[shapiroronny]

Would be great to add support for container query length units which is missing and are not parsed correctly: cqw and cqh are probably the most popular but also consider these:
cqi, cqb, cqmin and cqmax.

If there are any workarounds, that would also be great for now.
Currently getAsCSSString for a value like 1.14cqw is 1.14 cqw which is invalid by most browsers.

[phax]

Will be part of the upcoming 7.0.5 release.
From this version on, the parser will not limit to any specific pre-built dimensions but instead would allow any identifier.