[SPIRV] Add support for the SPIR-V extension SPV_KHR_bfloat16 (#155645) This PR introduces the support for the SPIR-V extension `SPV_KHR_bfloat16`. This extension extends the `OpTypeFloat` instruction to enable the use of bfloat16 types with cooperative matrices and dot products. TODO: Per the `SPV_KHR_bfloat16` extension, there are a limited number of instructions that can use the bfloat16 type. For example, arithmetic instructions like `FAdd` or `FMul` can't operate on `bfloat16` values. Therefore, a future patch should be added to either emit an error or fall back to FP32 for arithmetic in cases where bfloat16 must not be used. Reference Specification: https://github.com/KhronosGroup/SPIRV-Registry/blob/main/extensions/KHR/SPV_KHR_bfloat16.asciidoc
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