feat(react): add `StepLabel`, `StepContent`, `Step` and `Stepper` components #565

Job	Run time
ʦ Typecheck (STATIC ANALYSIS) (18.x)	3m 31s
💅 Storybook (18.x)	4m 19s
🌳 ESLint (STATIC ANALYSIS) (18.x)	3m 36s
👾 Unit Tests (18.x)	5m 21s
🚧 Build (18.x)	3m 18s
	20m 5s

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