C api and unit tests for vnf converter #131

Job	Run time
Build sdist and set version	33s
build-cpp-test-linux (debug, gcc)	4m 48s
build-cpp-test-linux (debug, clang)	2m 57s
build-cpp-test-linux (release, gcc)	6m 16s
build-cpp-test-macos (debug)	3m 17s
build-cpp-test-linux (release, clang)	4m 32s
build-cpp-test-macos (release)	3m 18s
Build and test in Conda (ubuntu)	56s
build-cpp-test-windows (debug, msvc)	5m 30s
Build and test in Conda (windows)	4m 21s
build-cpp-test-windows (debug, clang-cl)	6m 42s
build-cpp-test-windows (release, msvc)	6m 48s
build-cpp-test-windows (release, clang-cl)	8m 54s
build-and-test-python (linux-x64)	3m 47s
build-and-test-python (linux-aarch64)	8m 9s
build-and-test-python (macos)	2m 20s
build-and-test-python (windows)	10m 27s
publish-wheels	5s
	1h 23m 40s

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