Add support for Apple visionOS to Conan 2.0

[stevn]

Changelog: Feature: Add support for Apple visionOS.
Docs:Omit

Closes: #14496

…f32db2322677d55d3d13 and resolve merge conflicts).

Issue: #14496
Original pull request for Conan 1.x: #14497

• Refer to the issue that supports this Pull Request.
• If the issue has missing info, explain the purpose/use case/pain/need that covers this Pull Request.
• I've read the Contributing guide.
• I've followed the PEP8 style guides for Python code.
• I've opened another PR in the Conan docs repo to the develop branch, documenting this one.

[stevn]

Works for me with CMake built from latest git source, Xcode 15 beta 6, visionOS 1 simulator runtime 2. I am unsure about GNU triplet values (visionos vs xros) and qbs.

[memsharded]

This is looking good from my ignorance of OSX and visionOS, but also looks like low-risk (must be documented as experimental in the docs).

Will ask for extra feedback from more experts in Apple. Thanks very much for your contribution!

[stevn]

Looks like visionOS will be supported in next CMake release: 3.28.0

https://gitlab.kitware.com/cmake/cmake/-/merge_requests/8581

And these updates will probably also be helpful:

https://gitlab.kitware.com/cmake/cmake/-/issues/24946
https://gitlab.kitware.com/cmake/cmake/-/merge_requests/8586