Previously, when using the cunningham bin to build tokens, the CSS
file always included utility classes, resulting in duplicated CSS
utility classes on the consumer side if no specific CSS optimizer
is defined ( its local cunningham-tokens.css + the one from the
react package ). Now, this new feature introduces a param named
--utility-classes that must be provided to generate those classes.
This params is henceforth only provided to the bin inside the tokens
package.
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