deduplicate with codspeed benchmarks

[ev-br]

codspeed benchmarks (https://codspeed.io/OpenMathLib/OpenBLAS) run on each PR to the main OpenBLAS repository (https://github.com/OpenMathLib/OpenBLAS/)

The openblas_wrap f2py setup is very similar to the one used here: the main difference is that we either build openblas manually (for codspeed) or reuse the scipy_openblas32 nightly wheel (here). Would be nice to share the f2py wrappers and benchmarks themselves.

The blocker is that meson.build and pyproject.toml for openblas_wrap hardcode the dependency on scipy_openblas32. This also blocks #8.