ENH: Add wrapping configuration to ITKConfig.cmake

Needed for the ITKExamples, so that we can know what type of wrapping is installed.
The ITK_WRAP_PYTHON_VERSION is there if we need to add a version check in the examples.

Change-Id: I5d970a976850bef2a553043065b2273bdc4749e1
Merge topic 'AddWrappingConfig'

65ac011f ENH: Add wrapping configuration to ITKConfig.cmake