Support space separated functions

[redonkulus]

Space separated functions are supported by all modern browsers. We should look into supporting this via a new configuration option (so we do not break existing apps that still support IE).

References:

• https://css-tricks.com/no-comma-color-functions-in-css/
• Slack discussion https://atomiccss.slack.com/archives/C8ANGMQJW/p1661161518793789