Add ObjCMethodDecl.IsPropertyAccessor. #525

Job	Run time
linux-x64 (x64, release, ubuntu)	3m 43s
linux-arm64 (arm64, release, ubuntu)	3m 38s
linux-x64 (x64, debug, ubuntu)	3m 39s
windows-x64 (x64, debug, windows)	5m 36s
macos-arm64 (arm64, debug, macos)	3m 8s
linux-arm64 (arm64, debug, ubuntu)	3m 29s
windows-arm64 (arm64, release, windows)	5m 32s
windows-x64 (x64, release, windows)	5m 33s
macos-arm64 (arm64, release, macos)	3m 41s
windows-arm64 (arm64, debug, windows)	5m 56s
sign-nuget	-1s
publish-nightlies-azure	0s
publish-nightlies-github	0s
	43m 54s

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