Hide local Picker API and disable it based on flag

Bug: 202733511
Test: atest MediaProviderTests
Test: atest CtsPhotoPickerTest

Merged-In: Ic81e994e5259499644ab39eeac536e96d3155d5c
Change-Id: Ic81e994e5259499644ab39eeac536e96d3155d5c
6 files changed