Use porting::optional in olp-cpp-sdk-read instead of boost::optional. #2003

Job	Run time
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 48s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 36s
PSV.Linux.22.04.gcc11	8m 26s
PSV.Linux.22.04.gcc9.Cpplint	9m 9s
PSV.Linux.22.04.gcc13	12m 29s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 18s
PSV.MacOS13.Xcode15.x86_64	3m 49s
PSV.MacOS14.Xcode15	3m 1s
PSV.Clang.Format.Checker	48s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 4s
PSV.Linux.22.04.clang	9m 25s
PSV.iOS.MacOS15.Xcode16	9m 33s
PSV.MacOS15.Xcode16	6m 41s
PSV.Commit.Checker	5s
PSV.iOS.MacOS14.Xcode15	7m 39s
PSV.iOS.MacOS13.Xcode14	13m 58s
PSV.iOS.MacOS13.Xcode15	18m 3s
PSV.Win.VC2022	9m 53s
PSV.Linux.Android.22.04	6m 4s
	2h 18m 49s

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