C++ tests

If you build FlagGems with C extensions with FLAGGEMS_BUILD_CTESTS cmake option ON, you can run the ctest in the dir FlagGems/build/cpython-3xx with command:

ctest .

This will run all the test files under FlagGems/ctests

Use ctest -V —R xxx_test for a specific test with log info, where

• -R <regex>: Runs only the tests whose names match the given regular expression.

• -V: Enables verbose mode, printing detailed output for each test, including any messages sent to stdout/stderr.

For example:

TORCH_CPP_LOG_LEVEL=INFO ctest -V -R test_triton_reduction

we use pytorch aten log as well, so you need set the env TORCH_CPP_LOG_LEVEL=INFO for more logs in libtorch_example.