[Fix] (MG_Backend/DirectVulkan): support Voxy rendering

Implemented:

- Advertise Voxy-required DirectVulkan extensions without raising the reported OpenGL version.

- Add DirectVulkan compute, indirect draw count, DSA, readback, and buffer state paths needed by Voxy.

Fixed:

- Enable Vulkan shaderInt64 and drawIndirectFirstInstance so Voxy baseInstance-driven LOD draws address the correct section data.

- Fix DirectVulkan synchronization, framebuffer, texture readback, and shader interface handling used by Voxy and Minecraft screenshots.

Tests:

- Add MG_Test coverage for DirectVulkan extension advertising, DSA buffer/texture/framebuffer/vertex-array behavior, persistent mapped readback, and shader/program paths.

MobileGL/MG_State/GLState/BufferState/BufferObject.h

@@ -25,6 +25,7 @@ namespace MobileGL {
         AtomicCounter,
         DispatchIndirect,
         DrawIndirect,
+        Parameter,
         ShaderStorage,
         BufferTargetCount,
         Unknown = -1

MobileGL/MG_State/GLState/BufferState/BufferState.h

@@ -16,7 +16,7 @@ namespace MobileGL::MG_State::GLState {
         ToArray(BufferTarget::Vertex, BufferTarget::Uniform, BufferTarget::CopyRead, BufferTarget::CopyWrite,
                 BufferTarget::PixelPack, BufferTarget::PixelUnpack, BufferTarget::Query, BufferTarget::Texture,
                 BufferTarget::TransformFeedback, BufferTarget::AtomicCounter, BufferTarget::DispatchIndirect,
-                BufferTarget::DrawIndirect, BufferTarget::ShaderStorage);
+                BufferTarget::DrawIndirect, BufferTarget::Parameter, BufferTarget::ShaderStorage);
     constexpr const auto BufferBindPointTargets = ToArray(BufferTarget::Uniform, BufferTarget::TransformFeedback,
                                                           BufferTarget::AtomicCounter, BufferTarget::ShaderStorage);