XBLAS as part of this repository?

[ACSimon33]

Hi,

I wanted to ask if there is interest in having the XBLAS sources in this repository. What that would enable:

• automatic build of XBLAS when -DUSE_XBLAS is set in CMake
• validation of XBLAS with various compilers and validated builds on Linux, macOS, and Windows
• Index64 and extended _64 APIs for XBLAS routines
• Shared XBLAS libaries

I'm happy to do the work and create a PR. Let me know if that's something you want in this repo.

Best,
Simon