Add story for elevation
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## Summary by CodeRabbit
- **New Features**
- Introduced new elevation color calculation methods for both Dark and
Light mode themes, enhancing the visual hierarchy in the user interface.
- **Documentation**
- Added Storybook documentation for the `Elevation` component, allowing
for interactive testing and showcasing of elevation styles.
- **Style**
- Implemented new `Elevation` component with nested styling to represent
different UI layers effectively.
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