TreeView: Add ability to update selected items from outside the tree

[silvalaura]

Currently the preselectedItems TreeView prop only renders on initial load. We should support adopters updating the selected items directly through the data without manually clicking on the checkboxes.

Use Cases:

• Ability to clear all selected items at once (On multi-select treeviews, consider adding separate "select all" or "unselect all" controls.)
• For multi select, ability to deselect a selected item by clicking on a tag (this is a common use case for filtering)
• QUESTION, For single select, do we want to support this or always force an item to be selected??

Cases to consider:

• If a child item is deselected, all the parents need to update
• If a parent item is deselected, all the children item need to update
• If a parent AND child item is deselected, both the parents and children need to update
• If an item is collapsed and selected, it should update appropriately
• If an item is expanded and selected, it should update appropriately
• onSelectedChange should continue to only get called once
• Should not affect off

Slightly unrelated but another important addition for TreeView:

• Return itemId on onExpandedChange: onExpandedChange?: (event: React.SyntheticEvent, itemId: string) => void;

Some work for this was started on https://github.com/cengage/react-magma/tree/feat/tree-view-pt7