ENH: Add OpenBLAS wrap

[HaoZeke]

OpenBLAS is absolutely massive; but this seems to be a reasonable starting point for seeing wider use. We support a bunch of configurations seen here [1] (but only for dynamic builds, which should be the use case for subproject usage anyway).
The project will eventually be upstreamed if enough adoption takes place, and progress can be tracked on the forked repo from whence this is generated [2].
Tests pass on CI for Windows [3], Linux and MacOS [4]; for a reasonable set of baseline architectures.

This is a squashed single-commit contribution representing commits by me (@HaoZeke), @mtsokol and @rgommers.

Extraction from the branch is done via rsync, basically:

rsync -zarv --prune-empty-dirs --include="*/" --include="meson_options.txt" --exclude="*" $SDIR/ $DDIR
rsync -zarv --prune-empty-dirs --include="*/" --include="meson.build" --exclude="*" $SDIR/ $DDIR
# Remove benchmarks

Along with some manual copies of additional scripts and .c files only needed for the meson build.

As a complex project with a plethora of options, any suggestions are also welcome (maybe best expressed via issues on the fork [2]).

[1] https:/HaoZeke/OpenBLAS/blob/mesonBasic/meson_options.txt
[2] https:/HaoZeke/OpenBLAS/tree/mesonBasic
[3] https:/HaoZeke/OpenBLAS/blob/mesonBasic/.github/workflows/meson.yml
[4] https:/HaoZeke/OpenBLAS/blob/mesonBasic/.github/workflows/meson_linux_darwin.yml

[jpakkane]

WARNING: Variable 'openblas_dep' in the subproject 'subprojects/OpenBLAS-0.3.28' is not found

[HaoZeke]

WARNING: Variable 'openblas_dep' in the subproject 'subprojects/OpenBLAS-0.3.28' is not found

Sorry, checked via tools/sanity_checks.pynow.

[jpakkane]

ERROR: Unknown compiler(s): [['gfortran'], ['flang'], ['nvfortran'], ['pgfortran'], ['ifort'], ['ifx'], ['g95']]

You need to edit ci_config.json to add the Debian packages needed to build this package.