RSTSR sub-project OpenBLAS-FFI

This sub-project is used for generating BLAS FFI for OpenBLAS.

There are already some rust BLAS FFI crates. However, there may be some additional issues to be tackled:

• LP64/ILP64 support,
• Custom suffixes,
• Non-standard BLAS functions,
• OpenBLAS specific utilities,
• For OpenMP or pthread compiled OpenBLAS, we need to add some utilities to both handling parallel and single-threaded.

Not all tasks will be handled currently. We will first try to make OpenBLAS device in RSTSR work.