[accordion] Implement Accordion

[michaldudak]

This is the place to gather ideas, measure interest and discuss the API and implementation details of the accordion component and hook.

See #10 for the umbrella issue to track progress on Base UI and mui/material-ui#6218 for the problem this project solve.

[oliviertassinari]

Material UI id API feels so outdated (e.g. id={summary.props['aria-controls']}) now that we can use the context and useId https://mui.com/material-ui/react-accordion/#basic-accordion

[oliviertassinari]

To consider what we should do with the arrow key navigation https://www.w3.org/WAI/ARIA/apg/patterns/accordion/#keyboardinteraction. I don't know if we want this, I guess, why not?

[logonoff]

an idea for the base-ui accordion component is to use the details and summary HTML elements for the component so that the accordion would still work for users who have javascript turned off. i feel like semantically it might also make more sense since its functionality is similar to the accordion component

[michaldudak]

Related issue to take into consideration: #1147