ARIA Pattern.

API design document: https://www.notion.so/mui-org/base-ui-Dialog-API-50cf61260f5e40bda6b974e93487f77e

Related issues
Each of these related issues should be considered when designing and implementing this new component. When this issue is resolved, these related issues should be closed.

• [dialog] Support scrollbar-gutter #79
• [dialog] Extra animation of Dialog container (Modal FocusTrap is not synchronised with animation events) #16