Merge pull request #24136 from komakai:visionos_support

Add experimental support for Apple VisionOS platform #24136

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch

This is dependent on cmake support for VisionOs which is currently in progress.
Creating PR now to test that there are no regressions in iOS and macOS builds

cmake/OpenCVDetectPython.cmake

@@ -175,7 +175,7 @@ if(NOT ${found})
       endif()
     endif()
 
-    if(NOT ANDROID AND NOT IOS)
+    if(NOT ANDROID AND NOT IOS AND NOT XROS)
       if(CMAKE_HOST_UNIX)
         execute_process(COMMAND ${_executable} -c "from sysconfig import *; print(get_path('purelib'))"
                         RESULT_VARIABLE _cvpy_process
@@ -240,7 +240,7 @@ if(NOT ${found})
                           OUTPUT_STRIP_TRAILING_WHITESPACE)
         endif()
       endif()
-    endif(NOT ANDROID AND NOT IOS)
+    endif(NOT ANDROID AND NOT IOS AND NOT XROS)
   endif()
 
   # Export return values