Log secure settings in MockImeSession#getCurrentInputMethodId()

This CL introduces some additional debug info into

  MockImeSession#getCurrentInputMethodId()

to diagnose further on why

  InputMethodManager#getCurrentInputMethodInfo()

does not start returning the IME ID for MockIme after

  adb shell ime enable --user <userId> <MockImeId>
  adb shell ime set --user <userId> <MockImeId>

This CL only adds new logs to logcat. There must be no change in the
test expectations.

Bug: 354782333
Test: atest CtsInputMethodTestCases
Flag: TEST_ONLY
Change-Id: Icc481341988583aa7ccb39052ae31e31277a2841