Initialize `VK_EXT_mesh_shader` automatically whenever it is available #1502

Job	Run time
cmake-build-macos (macOS - Clang (Xcode), macos-latest, Debug, clang, clang++, Xcode, -DLVK_WITH_...	5m 16s
Android (Ubuntu)	7m 16s
cmake-test-ubuntu (Ubuntu - Clang, ubuntu-latest, Debug, clang-16, clang++-16, Unix Makefiles)	4m 1s
cmake-build (Ubuntu - Clang, ubuntu-latest, Debug, clang-16, clang++-16, Unix Makefiles)	3m 46s
cmake-build (Windows - MSVC 2022 (glslang), windows-latest, Debug, cl, cl, Visual Studio 17 2022,...	4m 7s
cmake-build (Ubuntu - Clang (Wayland), ubuntu-latest, Debug, clang-16, clang++-16, Unix Makefiles...	3m 42s
	28m 8s

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