[libc] Pull last dependencies into rpc_util.h (#116693) Summary: Last bit in-place to remove the dependencies on LLVM libc headers. This just pulls the `sleep_briefly`, `std::optinal` and `type_traits` definitions into the `rpc_util.h` header. This duplicates some code for now but will soon be moved into the `include/rpc` directory. At that point I will remove all the `LIBC_INLINE` and just make it `RPC_INLINE`. Internal use will then have a wrapper to make it all LIBC namespaced, implementations will then implement their own handling.
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