build and test csharp decoder #1597

Job	Run time
Build and test with Python 2.7	37s
Build and test with .NET	41s
Build and test cmake:gcc	49s
Build and test cmake:package	1m 8s
Build and test cmake:clang-old	49s
Build and test cmake:clang:asan	1m 23s
Build and test cmake:clang:ubsan	1m 1s
Build and test cmake:static	1m 3s
Build and test cmake:clang:tsan	1m 2s
Build and test cmake:clang	49s
Build and test cmake-win64:msvc-rel	1m 59s
Build and test bazel:research	1m 6s
Build and test python3.10:clang	2m 15s
Build and test python3.10-win	50s
Build and test cmake-osx:gcc	34s
Build and test cmake-win64:msvc-dbg	48s
Build and test bazel:root	1m 3s
Build and test cmake-osx:clang	35s
Build and test maven	1m 4s
Build and test cmake:gcc-old	40s
Build and test cmake:qemu-arm-neon-gcc	1m 24s
Build and test fuzz:clang	1m 1s
Build and test bazel-osx:java	3m 51s
Build and test bazel-win:research	2m 14s
Build and test bazel-win:root	1m 7s
Build and test bazel:java	2m 38s
Build and test bazel-osx:root	46s
Build and test bazel:go	1m 22s
Build and test bazel-osx:research	1m 3s
Build and test bazel-osx:go	1m 44s
	37m 26s

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