build and test csharp decoder #1598

Job	Run time
Build and test with Python 2.7	36s
Build and test with .NET	24s
Build and test cmake:gcc	52s
Build and test cmake:clang-old	45s
Build and test cmake:gcc-old	37s
Build and test cmake:clang:asan	1m 9s
Build and test cmake:static	53s
Build and test cmake:package	1m 12s
Build and test cmake:clang	55s
Build and test cmake-osx:gcc	24s
Build and test cmake-osx:clang	22s
Build and test cmake:qemu-arm-neon-gcc	3m 13s
Build and test cmake:clang:ubsan	1m 9s
Build and test cmake:clang:tsan	1m 0s
Build and test cmake-win64:msvc-rel	1m 3s
Build and test cmake-win64:msvc-dbg	52s
Build and test bazel-osx:root	1m 31s
Build and test fuzz:clang	55s
Build and test bazel:go	1m 24s
Build and test bazel:root	1m 5s
Build and test maven	1m 2s
Build and test python3.10-win	50s
Build and test bazel:java	2m 21s
Build and test bazel:research	51s
Build and test bazel-osx:java	3m 35s
Build and test bazel-win:root	1m 28s
Build and test bazel-win:research	1m 58s
Build and test python3.10:clang	2m 6s
Build and test bazel-osx:research	48s
Build and test bazel-osx:go	1m 14s
	36m 34s

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