cmake: add USE_SYSTEM_* options; support find_package(FP16) #23
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Similar to the work done in pytorch/pytorch#37137, this adds the following CMake options:
USE_SYSTEM_LIBS
USE_SYSTEM_PSIMD
USE_SYSTEM_GOOGLEBENCHMARK
USE_SYSTEM_GOOGLETEST
This is particularly useful in the context of Nix, where we can build these libraries once and then re-use them elsewhere to avoid rebuilding vendors dependencies.
Additionally, adds a CMake configuration file to make it possible for CMake-based projects to use
find_package
to consume this library.