Placeholder for the follow-up tasks of #7468

Needs to do the following task after #7468.

1. Add a device aspect in pipes.hpp. This would also let the user check if a device supports host-pipes. And here you could just check Dev.has(aspect::ext_oneapi_host_pipe_or_something).
2. Remove the `const_cast` in the pipes.hpp and contain the write pointer in a different `const void *` member.