rtio: Chained timeouts

[teburd]

Is your enhancement proposal related to a problem? Please describe.
Provide timeouts for RTIO, which would enable timeouts to be used across any RTIO capable device in a generic way.

Describe the solution you'd like
Using the same ideas io_uring has for linked timeouts is likely the best route. The idea being you setup a timeout operation that then links/chains into the operations you like to timeout on. The entire chain must complete before the timeout fires otherwise the remaining operations would be cancelled with -ETIMEOUT as an error code.

See IORING_OP_LINK_TIMEOUT with a prep function documented here https://man7.org/linux/man-pages/man3/io_uring_prep_link_timeout.3.html

Describe alternatives you've considered
io_uring offers other timeout operations that track, for the rings setup, the total number of completions to timeout on. E.g. you submit N submissions, and have a timeout setup to wait for N completions with T time.

This is actually more complex than the linked timeout in my opinion, and doesn't necessarily match up as well with how we'd expect to program typical I/O operation chains and timeouts.

Additional context
Timeouts are widely useful and are a desired feature of Bus and Sensor I/O operations

#27715 #33230 and many more