Add UnpackJob class to unpack an archive

The "Extract here" menu item now actually unpacks the archive.

Bug: 406328303
Bug: 406328534
Flag: com.android.documentsui.flags.use_material3
Flag: com.android.documentsui.flags.zip_ng_ro
Test: atest DocumentsUIGoogleTests:com.android.documentsui.services.UnpackJobTest

Change-Id: I9e8c81d703b6f937e4a5bb39f445395ec6045080