Revert "Revert "[incremental/pm] LauncherApps APIs for loading state and progress""

This reverts commit 69475be8.
Also reverts commit Iaf8e2c075f188df95c68824b71362629c6adabfc.

Reason for revert: Trying again but will submit with new tests

BUG: 165841645
Test: atest NexusLauncherOutOfProcTests
Test: atest LauncherAppsSingleUserTest
Test: atest LauncherAppsMultiUserTest
Test: atest LauncherAppsProfileTest
Test: atest LimitAppIconHidingTest
Change-Id: I5ed5871ccddefbd922b3aa3ee4c1ad53cc0bfa9b