Add Attr.ObjCRuntimeNameMetadataName. #562

Job	Run time
windows-x64 (x64, release, windows)	5m 14s
windows-arm64 (arm64, debug, windows)	5m 29s
macos-arm64 (arm64, release, macos)	2m 47s
macos-arm64 (arm64, debug, macos)	6m 7s
windows-arm64 (arm64, release, windows)	5m 27s
linux-x64 (x64, debug, ubuntu)	3m 30s
linux-x64 (x64, release, ubuntu)	3m 37s
linux-arm64 (arm64, debug, ubuntu)	3m 28s
windows-x64 (x64, debug, windows)	5m 6s
linux-arm64 (arm64, release, ubuntu)	3m 32s
publish-nightlies-github	0s
sign-nuget	0s
publish-nightlies-azure	0s
	44m 17s

Provide feedback