Adds ChooserSelector

ChooserSelector routes Chooser requests to either the bundled or
unbundled Chooser depending on the value of the UNBUNDLED_CHOOSER flag.

Test: atest ChooserSelectorTest
BUG: 241104067
Change-Id: I9ca3fa3103c7710cce61bc09352c27e8fbc19140
5 files changed