[Mosaic GPU] Query SM and PTX ISA dynamically using driver and LLVM
Originally proposed in #24021. Slightly rewritter to make testing with internal LLVM toolchains better.
Use CUDA driver API to query major and minor compute capabilities, thus arriving at a "base" SM string (e.g. `sm_90`).
Then use LLVM to see if we can "upgrade" the base SM string to one that enables architecture-specific capabilities (e.g. `sm_90a`).
Then use LLVM to map the SM string to a PTX ISA version that supports the SM.
Co-authored-by: Andrey Portnoy <aportnoy@nvidia.com>
PiperOrigin-RevId: 689286774
