[SPIR-V] Add descriptor heap -fvk-resource-heap-stride / -fvk-sampler-heap-stride CLI flags

[jzakharovnv]

Building off of #8518, this PR adds two new command-line flags that override the ArrayStride of the descriptor heap runtime arrays emitted by -fspv-use-descriptor-heap. It is part 3/4 in a series.

-fvk-resource-heap-stride and -fvk-sampler-heap-stride sets the stride for ResourceDescriptorHeap SamplerDescriptorHeap arrays respectively. N and M must be a power of two in [8, 256]. When set, the CLI value takes the highest precedence.

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✅ With the latest revision this PR passed the C/C++ code formatter.

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