Setup SearchResultIcon for single cell results

SearchResultIcon will be able to render apps, shortcuts and remote actions. It can also handle its own focused state drawing.

Screenshot: https://screenshot.googleplex.com/C3KgjJtLQTBPgaf

Bug: 170752716
Test: Manual
Change-Id: I460a9c128ea3f5814784e342c5d5fa5b7e310882