Use InputConfig flags in InputWindowHandle API

Use the android.os.InputConfig flags to control input window behavior in
InputWindowHandle. This consolidates the old boolean flags and
inputFeatures flags into one set of flags so that the InputConfigs are
the sole set of flags that change change how an input window behaves.

After this change, InputFeatures and LayoutParamsFlags are specific to
WM, which is responsible for converting them into InputConfig flags.
Trivial conversions between these flags are done in InputConfigAdapter.

The LayoutParams type and flags are still part of the this API to send
these attributes to native code. However, they are no longer used by
input.

Bug: 216806304
Test: manual: verify touch functionality
Test: atest WindowStateTests
Change-Id: I5b384770272c111680783ee8ab01ecd6e03f42be