[DocsUI M3] Add tooltip for long file names

Add a tooltip to display the full file name on a long press
or hover over the item.

See the bug for a demo.

Bug: 406304742
Test: m DocumentsUIGoogle && manual inspection
Flag: com.android.documentsui.flags.use_material3
Change-Id: I6f91e9434b4ef8b55161292686494eb35402a6e9