Metal API Validation failure on Mac2 when Argument Buffers enabled

[SRSaunders]

Metal's minimum constant buffer offset alignment is 32 bytes for Mac2/Metal3 machines and 256 bytes for the iOS Simulator, which are both in contrast to 4 bytes for Apple 1+/Metal 4 machines. MoltenVK does not seem to take this into account and I am getting the following errors in Sascha Willems' Vulkan samples project when Argument Buffers are enabled and XCode's Metal API validation is turned on:

-[MTLDebugRenderCommandEncoder validateCommonDrawErrors:]:5843: failed assertion `Draw Errors Validation
Vertex Function(main0): the offset into the buffer spvDescriptorSet0 that is bound at buffer index 0 must be a multiple of 32 but was set to 40.'

These errors disappear when Argument Buffers are disabled. Note I am using a x86_64 + AMD Mac running Sequoia. I realize these older x86_64 machines may not be a focus going forward, but nonetheess I believe this should work properly and the cause seems to be inside MVKDescriptorPool::Create():

uint32_t gpuAlign = std::max(std::max<uint32_t>(sizes.texture.align, sizes.sampler.align), std::max<uint32_t>(sizes.pointer.align, 1));

should instead be:

uint32_t gpuAlign = std::max(std::max<uint32_t>(sizes.texture.align, sizes.sampler.align), std::max<uint32_t>(sizes.pointer.align, sizes.uniform.align));

Where a new uniform field has been set up properly with the required constant buffer offset alignment in device->getPhysicalDevice()->getArgumentBufferSizes();

I will submit a draft PR for this, but am looking for feedback since others may have a better way of fixing.

While the above change works, I am having second thoughts and am uncertain on how / where to adjust gpuAlign in the descriptor pool creation code. I think I will leave it up to the experts here to assess this issue and correct if possible.

**If the above approach is close to being correct, I do have complete code for it and can submit a PR if desired.