libsnapshot: Propagate io_uring enablement to daemon

During selinux init transition, system properties
are not yet enabled. Hence, store the io_uring feature
in snapshot.proto and propagate the same snapuserd
daemon

Bug: 214340811
Test: OTA
Signed-off-by: Akilesh Kailash <akailash@google.com>
Change-Id: I5458127b00946b5254d5c68d407ab525a0075cb9