Rename IInputConnectionWrapper to RemoteInputConnectionImpl

This is a mechanical refactoring CL that renames

  com.android.internal.view.IInputConnectionWrapper

to

  com.android.internal.inputmethod.RemoteInputConnectionImpl

with no observable behavior change.

Bug: 192412909
Test: presubmit
Test: No lint error under core/java/com/android/internal/inputmethod
Change-Id: I171106ad0b46fbb495a6bf08d10f33915c2d29ac