Update info page to new UI

1. Use CollapsingToolbarLayout to implement the mock UI.
2. Remove InspectorFragment and only use InspectorActivity.
3. Put title and showDebug value to InspectorController instead
   of put whole Bundle.
4. Upadte thunbnail background and debug info background color
   to fit theme.
5. Update InternalStorageUiTest due to delete/undo rollback,
   also make it test more robust and add @LargeTest.

Bug: 79901873
Fix: 118144933
Test: atest DocumentsUITests
Change-Id: Iedccb335b25d6e4e2b630c985eb5c7afcc902317