No-op refactor synthetic path utils

Moved existing redacted util methods from MediaProvider into a new
SyntheticPathUtils also containing picker util methods, with a few
more utils to come.

Test: atest SyntheticPathUtilsTest
Bug: 195009143
Change-Id: Id461ce7de4fb1669da9990cf715ce9b299e5b584
Merged-In: Id461ce7de4fb1669da9990cf715ce9b299e5b584
(cherry picked from commit c1bbc5e65c1c1b435c75e9ff8465b55b2e9543c6)
5 files changed