Introduce a NUMA-aware sptrsv

[anyzelman]

This sptrsv will use the schedule provided by OneStopParallel, as sketched eg. here:

https://arxiv.org/abs/2503.05408

Ideally, the sptrsv will use the type structures introduced by Spampinato et al. here:

https://dl.acm.org/doi/abs/10.1145/3589246.3595373

[anyzelman]

Note from the development MR:

No specific milestone will be set for this new feature, but please raise it if this functionality is urgent and we can attempt take that into account. This MR will not address the triangular type structure from Spampinato et al.- ideally first the dense backend (with dense trsv support) is merged after which a new MR can enable sptrsv support through the functionalities provided by this MR.