Replace gpu-alloc with gpu-allocator for vulkan.

[Elabajaba]

Connections
Closes #5925

Description
TODO

Examples run, but there's a bunch of TODOs that need to be fixed.

• Move the gpu_allocator error impl somewhere else so it can be shared between both the dx12 and vulkan implementations
• Figure out map_buffer and unmap_buffer
• Do the allocations need to be wrapped in a mutex like they were when using gpu_alloc? I didn't because DX12 hal doesn't, but is that due to reference counted COM stuff?
• Clean up the allocator on drop.
• Decide if they're called block or allocation and use it consistently
• How do I know if it's a linear or tiling texture for the allocation description? (also, is the RT acceleration structure linear or tiling?)
• Misc cleanup

Testing
WIP

Checklist

• Run cargo fmt.
• Run taplo format.
• Run cargo clippy. If applicable, add:
  • --target wasm32-unknown-unknown
• Run cargo xtask test to run tests.
• Add change to CHANGELOG.md. See simple instructions inside file.

[nical]

Thanks for looking into this. Switching should wait for the next version of gpu_allocator to be released, because the current version doesn't support progressively growing the memory chunk size (which gpu-alloc does), and has a bug causing it to always use huge memory chunks instead of honoring AllocatorCreateDesc::allocation_sizes. Both of which were fixed in Traverse-Research/gpu-allocator#254.

[cwfitzgerald]

I'm going to close this as stale - please update the PR and ask to be re-opened if you're interested in continuing to pursue this change.

Also superseded by #8158