VS: Add Visual Studio 17 2022 generator

Help/generator/Visual Studio 17 2022.rst

Help/manual/cmake-generators.7.rst

Help/release/3.21.rst

Help/variable/MSVC_VERSION.rst

Source/cmCMakeHostSystemInformationCommand.cxx

Source/cmGlobalVisualStudio10Generator.cxx

Source/cmGlobalVisualStudioGenerator.cxx

Source/cmGlobalVisualStudioGenerator.h

Source/cmGlobalVisualStudioVersionedGenerator.cxx

Source/cmGlobalVisualStudioVersionedGenerator.h

Source/cmVisualStudioGeneratorOptions.cxx

Source/cmake.cxx

Tests/CMakeLists.txt

Tests/RunCMake/CommandLine/RunCMakeTest.cmake

Tests/RunCMake/GeneratorPlatform/RunCMakeTest.cmake

Tests/RunCMake/GeneratorToolset/RunCMakeTest.cmake

...s/RunCMake/GeneratorToolset/TestToolsetHostArchNone.cmake

Tests/VSExternalInclude/CMakeLists.txt