Feature: Added Tree View sidebar

[yair100]

Resolved / Related Issues

To prevent extra work, all changes to the Files codebase must link to an approved issue marked as Ready to build. Please insert the issue number following the hashtag with the issue number that this Pull Request resolves.

• For Feature: Add TreeView (in progress) #1928

Steps used to test these changes

Stability is a top priority for Files and all changes are required to go through testing before being merged into the repo. Please include a list of steps that you used to test this PR.

1. Expanded C:\Windows\WinSxS in Tree View and confirmed that there are no issues with performance or scrolling
2. Confirmed that custom icons are correctly loaded
3. Confirmed that the Tree View updates when folders are modified
4. Confirmed that the Tree View updates when enabling/disabling hidden items
5. Confirmed that hidden items are correctly faded
6. Confirmed that switching tabs stores the expansion state for each tab
7. Confirmed that Tree View behavior is disabled in Compact View
8. Confirmed that Tree View behavior works properly in Overlay View
9. Confirmed that right/left arrow keys expand and collapse the selected item in the Tree View
10. Confirmed that horizontal scrolling works
11. Confirmed that the sidebar in the Settings page works as expected