[discussion] Add Gantt Chart 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

This is about supporting people to implement Gantt Charts and the corresponding methodology:

For something that is "lighter", please refer to the Timeline component: #4782.

## Examples in other libraries

- https://www.visactor.io/vtable/demo/gantt/gantt-basic
- https://www.syncfusion.com/react-components/react-gantt-chart
- https://www.bryntum.com/products/gantt/
- https://dhtmlx.com/docs/products/dhtmlxGantt/
- https://svar.dev/react/gantt/

*([internal benchmark](https://www.notion.so/mui-org/Gantt-Chart-component-e0014e4a55ae44fe901d575b1886e78e))*

## Motivations

- User requests:
- https://x.com/derji83089/status/2041469170554961994
- https://x.com/ABM_Prottoy/status/2042001858856939943
- UI library requests:
- https://github.com/shadcn-ui/ui/issues/7477
- The equivalent request in MUI X: https://github.com/mui/mui-x/issues/8732. Now, it's not clear if this is something that we can deliver with a pure Base UI API, as it might be too low-level vs. the customization needs people have, but at the same time, the issue in MUI X is too positioned around Material UI, which is too opinionated. So opening this issue to have space for the community to contribute.