feat: add support for tree sections (#9013)
* initial tree stuff
* fix virtualized tree section expanding, update methods to remove flattenTree
* cleanup
* more cleanup
* update key after if its content node
* fix types when checking content node
* fix spacing
* update dynamic story
* update setSize with added getDirectChildren function
* fix types, update at method
* remove console logs
* add collection dependency to gridlist
* fix lint
* update yarn lock
* rename dynamic row section array
* add tests, fix setSize for top level nodes inside a section
* fix lint
* remove comments
* more cleanup
* comments and stuff
* fix tests
* these changes were made in oct and it's now jan so...
* lots of comments regarding skipping content nodes in tree
* skip content nodes is listlayout and collections, update keyboard delegate
* update yarn lock
* update direct children function
* comments
* update direct children functiona and remove collectionode type from gridlist
* update comments
* updates
* simplify logic for visible/non disabled item
* comments, small fixes
* make guarding against content node more robust
* optimize filtering content nodes in list layout
* optimize getting child array
* add helper function for cloning
* add comments
