StrictMode to catch storage while locked.

StrictMode to catch storage while locked.

When an app starts becoming Direct Boot aware, it can be difficult
to track down all the places they're reading data from credential
protected storage.

When a user is locked, credential protected storage is unavailable,
and files stored in these locations appear to not exist, which can
result in subtle app bugs if they assume default behaviors or
empty states. Instead, apps should store data needed while a user
is locked under device protected storage areas.

Bug: 110413274
Test: atest cts/tests/tests/os/src/android/os/cts/StrictModeTest.java
Change-Id: Ia390318efa6fefda8f10ac684d0206e67aa1d3dc