Add ThemeSwitcher, ComplexSelect components along with some Theme refactoring

[jeradrutnam]

Purpose

• Refactored oxygen UI theme to user extendTheme over createTheme to match the latest guideline from MUI
• Add new components
  • ComplexSelect

• ThemeSwitcher

• Update storybook with missing theming documentation

• Add router to sample app along with importing new oxygen-ui improvments

• Add support for multiple theming

<OxygenUIThemeProvider radialBackground> => <OxygenUIThemeProvider themes={[ { key: "default", label: "Default", theme: defaultTheme }, { key: "purple", label: "Purple", theme: purpleTheme } ]}>

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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