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It'd be nice to allow a process to send RT requests without granting
it the wide capabilities of CAP_SYS_ADMIN, and we already have a
capability which seems to almost fit this priority idea -
CAP_SYS_NICE? Would this fit there?

Being capable of setting IO priorities on per request or per thread
basis (be it async submission or w/ thread ioprio_set) is useful
especially when the userspace has its own prioritization/scheduling
before hitting the kernel, allowing us to signal to the kernel how to
order certain IOs, and it'd be nice to separate this from ADMIN for
non-root processes, in a way that's less error prone than e.g. having
a trusted launcher ionice the process and then drop priorities for
everything but prio requests.

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