Use porting::optional in olp-cpp-sdk-read instead of boost::optional. #2005

Job	Run time
PSV.Linux.22.04.gcc9.Cpplint	8m 50s
PSV.Linux.22.04.gcc9.Tests.CodeCov	11m 53s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	4m 2s
PSV.Linux.22.04.gcc11	8m 45s
PSV.iOS.MacOS13.Xcode14	12m 6s
PSV.iOS.MacOS15.Xcode16	5m 41s
PSV.iOS.MacOS14.Xcode15	11m 53s
PSV.Linux.22.04.clang	9m 8s
PSV.Win.VC2022	10m 6s
PSV.Linux.Android.22.04	6m 56s
PSV.MacOS15.Xcode16	4m 9s
PSV.Linux.22.04.gcc13	8m 53s
PSV.MacOS14.Xcode15	2m 54s
PSV.Commit.Checker	6s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 24s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 22s
PSV.MacOS13.Xcode15.x86_64	4m 54s
PSV.Clang.Format.Checker	54s
PSV.iOS.MacOS13.Xcode15	12m 35s
	2h 9m 31s

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