refactor(cli): auto-generate builtin colors

[unekinn]

@mimarz I found this in an old branch 😆

No need to look at this before V1, but I'm creating a PR so it doesn't get lost

This PR removes the need for the hard-coded tokens/build/builtin-colors.css file, but slightly complicates the code for the tokens build command.

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Latest commit: e4ed2d2

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[github-actions]

Preview deployments for this pull request:

Storybook - 3. Mar 2025 - 14:20

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	47.95%	3210 / 6694
🔵	Statements	47.95%	3210 / 6694
🔵	Functions	84.55%	219 / 259
🔵	Branches	77.41%	562 / 726

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