Rely on com.android.internal.os.SomeArgs

Before introducing new state tracking IDs to IInputConnectionWrapper,
this CL cleans up IInputConnectionWrapper to use
com.android.internal.os.SomeArgs instead of local-defined one in favor
of possible performance improvement thanks to the process grobal
object pool that com.android.internal.os.SomeArgs has.

This is a mechanical refactoring CL. No behavior change is intended.
Test: No new warnings in `adb logcat` from the following TAGs
      - IInputConnectionWrapper
      - InputMethodManager
      - InputMethodManagerService
      - InputMethodService
Bug: 35079353
Change-Id: Ic614f112f960382280acd8891b3af56d47679f08