[mlir][spirv] Add spirv-to-llvm conversion for group operations (#115501)

Lowering for some of the uniform and non-uniform group operations
defined in section 3.52.21 of the SPIR-V specification from SPIR-V
dialect to LLVM dialect.

Similar to #111864, lower the operations to builtin functions understood
by SPIR-V tools.

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Signed-off-by: Lukas Sommer <lukas.sommer@codeplay.com>