[IntelliSense] support coloring vars without colorspace

[wmertens]

The recommended way to define colors leaves off the colorspace so that opacity can be added separately.

However this means that you can't preview your colors easily in the editor.

Would it be possible to colorize variables based on their name and contents?

E.g. in the below snippet the extension could see that the variables start with --color and then based on their contents it can decide whether to show rgb (no %) or hsl (has %)

    /* For rgb(255 115 179 / <alpha-value>) */
    --color-primary: 255 115 179;

    /* For hsl(198deg 93% 60% / <alpha-value>) */
    --color-primary: 198deg 93% 60%;

    /* For rgba(255, 115, 179, <alpha-value>) */
    --color-primary: 255, 115, 179;