C api and unit tests for vnf converter #124

Job	Run time
Build sdist and set version	47s
build-cpp-test-windows (debug, msvc)	4m 2s
build-cpp-test-windows (debug, clang-cl)	4m 5s
Build and test in Conda (ubuntu)	53s
build-cpp-test-linux (debug, gcc)	2m 39s
build-cpp-test-windows (release, msvc)	4m 6s
Build and test in Conda (windows)	2m 58s
build-cpp-test-macos (debug)	36s
build-cpp-test-linux (debug, clang)	2m 23s
build-cpp-test-windows (release, clang-cl)	4m 7s
build-cpp-test-macos (release)	39s
build-cpp-test-linux (release, gcc)	2m 40s
build-cpp-test-linux (release, clang)	2m 40s
build-and-test-python (linux-x64)	3m 51s
build-and-test-python (linux-aarch64)	7m 49s
build-and-test-python (macos)	2m 0s
build-and-test-python (windows)	11m 36s
publish-wheels	5s
	57m 56s

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