[clang] [HLSL] Implement `Append` and `Consume` methods on `Append`/`ConsumeStructuredBuffer` (PR #118536)

[Justin Bogner via cfe-commits]

https://github.com/bogner commented:

Looks basically good, but I'll hold off on approving until we've discussed my comment regarding the API.

https://github.com/llvm/llvm-project/pull/118536