feat(scraps): add tokens (#103685)

Scoping down #103410 a bit, this PR adds our new color system to the
codebase.

These colors are autogenerated from Figma variables—the process will be
documented elsewhere.

Author: natemoo-re

knip.config.ts

@@ -17,6 +17,8 @@ const productionEntryPoints = [
   // this is imported with require.context
   'static/app/data/forms/*.tsx',
   // --- we should be able to get rid of those: ---
+  // (WIP) design system tokens
+  'static/app/utils/theme/scraps/**/*.tsx',
   // Only used in stories (so far)
   'static/app/components/core/quote/*.tsx',
   // Prevent exception until we build out coverage