rtio: Allow for other allocator strategies than mem blocks #95849
Description
Summary
mem blocks is a great fit for RTIO and its usage so far with sensors but as usage grows beyond sensors other allocator strategies may wish to be used
Describe the solution you'd like
An allocator interface defined and expected from any RTIO allocator, with the mem block allocator fitting this.
Basically add
#define RTIO_DEFINE_WITH_ALLOCATOR(sqe_sz, cqe_sz, allocator)RTIO_DEFINE_WITH_MEMPOOL can reuse this macro to do what it does today so no backwards incompatibility, some function pointer indirection will solve this.
Alternatives
No response
Additional Context
No response