[discussion] Add Cascader component?

*⚠️ Info: This issue is for product research, to gather community input. In this [base-ui repo](https://github.com/mui/base-ui) we are, currently, focused on the core set of components needed to create a great design system, so the probability we build this in this repo is very low.*

## Summary

## Examples in other libraries

- https://rsuitejs.com/en/components/cascader
- https://ant.design/components/cascader/
- https://github.com/Ademking/cascader-shadcn

*([internal benchmark](https://www.notion.so/mui-org/x-Cascader-component-2c3191e6e0c14230b3517db7862e8912))*

## Motivation

TBD

- User requests:
- /
- UI library requests:
- https://github.com/shadcn-ui/ui/issues/1875#issuecomment-2493800893
- https://github.com/mui/mui-x/issues/511