Adaptation of Shadow token to support UIKit and SwiftUI

DesignSystem.Object+Shadow.swift

// UIKit
extension CALayer {

  public func setShadow(_ level: Shadow) {
    shadowRadius = level.radius
    shadowOpacity = level.opacity
    shadowColor = level.uiColor.cgFloat
    
    shadowOffset = .init(
      width: level.x,
      height: level.y
    )
  }
}

// SwiftUI
#if canImport(SwiftUI)
@available(iOS 13, *)
extension View {
  
  public func shadow(_ level: Shadow) -> some View {
    shadow(
      color: level.color.opacity(level.opacity),
      radius: level.radius,
      x: level.x,
      y: level.y
    )
  }
}
#endif