Bring TreeView to stable

[sstrubberg]

Bring Treeview to stable. Definition of done.

Code

REF 11687

Accessibility

• https://github.com/carbon-design-system/carbon/issues/6792

Designs

• Latest design spec
• https://github.com/carbon-design-system/carbon/issues/5180: Original design issue
• https://github.com/carbon-design-system/carbon/issues/6203: Design enhancements issues

Variants

• [ ] https://github.com/carbon-design-system/carbon/issues/11874
• ~Multi-select~ Deferred for later development.

Website

• [ ] https://github.com/carbon-design-system/carbon-website/issues/2210
• [ ] https://github.com/carbon-design-system/carbon-website/issues/2211
• [ ] https://github.com/carbon-design-system/carbon-website/issues/2216
• [ ] https://github.com/carbon-design-system/carbon-website/issues/2209

Design kits

• [x] https://github.com/carbon-design-system/carbon-design-kit/issues/548
• [ ] https://github.com/carbon-design-system/carbon-design-kit/issues/549 (lower priority)
• [ ] https://github.com/carbon-design-system/carbon-design-kit/issues/550 (can ship without XD)