Update the light and dark palettes.

[dbatiste]

GAUD-9068

Just posting this draft PR for anyone who wants to see the palette as of yesterday. Extracted from Figma, with colors resolved to the existing color variables where possible. I only generated variables for colors so far. I'll be trying to apply these to a couple of components.

[github-actions]

Thanks for the PR! 🎉

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URL	https://live.d2l.dev/prs/BrightspaceUI/core/pr-6585/

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[dbatiste]

Also note: these lower level values are mapped from Figma, but it remains to be decided whether we actually want them in the code. We may just want --d2l-shadow-attached, --d2l-shadow-floating, and --d2l-shadow-inset.

[dbatiste]

We've made a bunch of changes... curious what you/others think of the semantic names.

Of note:

• Added the -sem- qualifier clearly identify our semantic variables and avoid any confusion or conflict. Both Jeff and I would also be onboard with -s- in effort to shorten if others want.
• The -background- is now included per Dave L's previous inquiry about what the colors were for. We could abbreviate to -bg- if people want, but we're not abbreviating border et al. so 🤷‍♂️ .
• The -color- is now included to enable us to add non-color variables for spacing and radius later.

I'm not sure how difficult it would be on the Figma side, but we might be able to flip things from --d2l-sem-background-color-elevated to --d2l-sem-elevated-background-color. Can consider that if people want.

[dbatiste]

I'll be closing this PR in lieu of individual PRs to update components and include visual-diffs for them.