build and test csharp decoder #1599

Job	Run time
Build and test with .NET	39s
Build and test with Python 2.7	39s
Build and test cmake-win64:msvc-dbg	42s
Build and test cmake:clang:asan	1m 3s
Build and test cmake:static	41s
Build and test cmake:gcc	44s
Build and test cmake:package	1m 1s
Build and test bazel-osx:root	57s
Build and test cmake:clang:ubsan	1m 8s
Build and test cmake-osx:clang	29s
Build and test cmake-win64:msvc-rel	1m 1s
Build and test cmake:clang-old	42s
Build and test cmake:gcc-old	53s
Build and test cmake-osx:gcc	23s
Build and test python3.10:clang	2m 2s
Build and test bazel:root	56s
Build and test cmake:clang:tsan	59s
Build and test bazel:research	55s
Build and test python3.10-win	51s
Build and test bazel:go	1m 29s
Build and test bazel-win:research	1m 14s
Build and test bazel-osx:java	2m 21s
Build and test bazel:java	2m 19s
Build and test cmake:clang	56s
Build and test maven	57s
Build and test fuzz:clang	47s
Build and test cmake:qemu-arm-neon-gcc	1m 34s
Build and test bazel-osx:research	1m 19s
Build and test bazel-win:root	1m 16s
Build and test bazel-osx:go	1m 35s
	32m 32s

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