Support for SPV_NV_cooperative_matrix2 and SPV_NV_tensor_addressing

Are [SPV_NV_cooperative_matrix2](https://github.khronos.org/SPIRV-Registry/extensions/NV/SPV_NV_cooperative_matrix2.html) and [SPV_NV_tensor_addressing](https://github.khronos.org/SPIRV-Registry/extensions/NV/SPV_NV_tensor_addressing.html) in the scope of SPIRV-LLVM-Translator?

Start by reviewing the linked SPV_NV_cooperative_matrix2 and SPV_NV_tensor_addressing specifications, then examine the translator's existing extension support. Determine whether each extension is in scope and what implementation work would be required; done means the scope and expected support are clearly decided.

Written by the indexing model from the issue text.