[C# target] Use Collections.EmptyList to prevent zero length allocations #1180

Job	Run time
cpp-lib-build (macos-12, clang, ON)	1s
build (macos-12, tool)	1s
cpp-lib-build (macos-12, clang, OFF)	1s
build (macos-12, cpp)	1s
cpp-lib-build (macos-12, gcc, ON)	1s
build (macos-12, csharp)	1s
cpp-lib-build (macos-12, gcc, OFF)	1s
build (macos-12, dart)	1s
cpp-lib-build (ubuntu-20.04, clang, ON)	2m 42s
build (macos-12, go)	1s
cpp-lib-build (ubuntu-20.04, clang, OFF)	4m 10s
build (macos-12, java)	1s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 26s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 6s
build (macos-12, javascript)	1s
cpp-lib-build (windows-2022, clang, ON)	4m 31s
cpp-lib-build (windows-2022, clang, OFF)	5m 3s
build (macos-12, typescript)	1s
cpp-lib-build (windows-2022, cl)	4m 6s
build (macos-12, php)	1s
build (macos-12, python3)	1s
build (ubuntu-20.04, tool)	3m 22s
build (ubuntu-20.04, cpp)	17m 35s
build (ubuntu-20.04, csharp)	1m 40s
build (ubuntu-20.04, dart)	4m 20s
build (ubuntu-20.04, go)	2m 53s
build (ubuntu-20.04, java)	1m 13s
build (ubuntu-20.04, javascript)	1m 38s
build (ubuntu-20.04, typescript)	10m 17s
build (ubuntu-20.04, php)	1m 26s
build (ubuntu-20.04, python3)	1m 13s
build (windows-2022, tool)	1m 47s
build (windows-2022, cpp)	23m 42s
build (windows-2022, csharp)	3m 6s
build (windows-2022, dart)	4m 9s
build (windows-2022, go)	6m 0s
build (windows-2022, java)	4m 0s
build (windows-2022, javascript)	2m 35s
build (windows-2022, typescript)	20m 56s
build (windows-2022, php)	2m 25s
build (windows-2022, python3)	1m 51s
	2h 23m 26s

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