chore(react): expose `generatePastelColor` and hook #430

Job	Run time
💅 Storybook (lts/*)	3m 47s
ʦ Typecheck (STATIC ANALYSIS) (lts/*)	2m 48s
🌳 ESLint (STATIC ANALYSIS) (lts/*)	3m 10s
👾 Unit Tests (lts/*)	4m 18s
🚧 Build (lts/*)	2m 43s
	16m 46s

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