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Metal: add useResource fallback for devices without MTLResidencySet (#727)

Replace the hard GPUFamilyApple6 gate with ArgumentBuffersTier2 and add
a runtime fallback for devices that lack MTLResidencySet (e.g. Apple
Paravirtual on CI macOS VMs).

ResidencySet path (default on capable hardware): resources are registered
in MTLResidencySet as before — no per-binding overhead.

Fallback path (!m_hasResidencySet): per-encoder useResources calls declare
resource residency before dispatches/draws. A BufferAddressMap provides
O(1) exact and O(log N) range-based GPU address → BufferImpl lookups so
that pointer fields in uniform data are automatically resolved for
residency. Pointer field offsets are collected from type layout reflection
at shader object layout init time, skipped entirely on the ResidencySet
path.

Also adds:
- Acceleration structure residency tracking (fixes pre-existing omission)
- Silent all-skip detection in the test harness: fails the run when a
  device probes as available but zero GPU tests execute
- bind-pointers-offset-address test exercising range-based address lookup
- SLANG_RHI_METAL_NO_RESIDENCY_SET env var to force the fallback path
- Feature::ResidencySet capability flag

Fixes #725
Part of shader-slang/slang#10841

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