feat(lib): Add AI Button

[louismaximepiton]

Types of change

• Non-breaking change
• Breaking change (fix or feature that would change existing functionality and usage)

Related issues

Closes #3522

Context & Motivation

Read #3522

Description

Add some CSS and documentation to handle AI Button.

Checklists

• I have read the contributing guidelines
• My change follows the developer guide
• My change pass all tests
• My change is compatible with a responsive display
• I have added tests (Javascript unit test or visual) to cover my changes
• My change introduces changes to the documentation that I have updated accordingly
  • Title and DOM structure is correct
  • Links have been updated (title changes impact links)
  • CSS for the documentation
• I have checked all states and combinations of the component with my change
• I have checked all the impacts for the other components and core behavior (grid, reboot, utilities)

Checklist (for Core Team only)

• The changes need to be in the migration guide
• The changes are well displayed in Storybook (be careful if example order has changed for DSM)
• The changes are compatible with RTL
• Manually test browser compatibility with BrowserStack (Chrome 120, Firefox 121, Edge 120, Safari 15.6, iOS Safari, Chrome & Firefox on Android)

Progression (for Core Team only)

• Code review
• Design review
• A11y review
• Commit on ouds/main following conventional commit

Live previews

• https://deploy-preview-3529--boosted.netlify.app/docs/components/buttons#ai-button

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