Replace build time only Slog's in state computer and visibilityApplier with protolog

Currently, there are many Slog.d logs which are compiled out, if
DEBUG=false. To be able to enable logs without recompiling, this CL
replaces those logs with protologs.

Bug: 393561240
Flag: EXEMPT logs only
Test: Enable logs manually via: adb shell cmd protolog logcat enable IME_VIS_STATE_COMPUTER_DEBUG
Change-Id: Id939dffe69e96a1f3d7b3ab3096f497c3590084d