Add Chooser custom actions

Add Chooser custom action support under a compile-time flag.

Bug: 262278109
Test: manual testing of the basic functionality
Test: manual custom actions testing with a test app
Test: atest IntentResolverUnitTests (with the both flag values)

Change-Id: Ib6f6b46aa4f693a544e0e52a6d1a3e63ba57b162
4 files changed