v0.28.1

Changelog

• 100f5c5 Align column group controls and separate neighboring brackets
• 195d379 Hide whole column groups on collapse and move toggles above headers
• 1bd0de6 Keep group tooltips on screen and remeasure after resizing while collapsed
• 11b1d7d Merge pull request #119 from bruin-data/TanayBensuYurtturk/column-collapse-group-fix
• 0cb2623 Support hidden column groups and keep expand controls reachable