Use porting::optional in olp-cpp-sdk-read instead of boost::optional. #2004

Job	Run time
PSV.Linux.22.04.gcc9.Cpplint	9m 0s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 43s
PSV.MacOS15.Xcode16	3m 53s
PSV.iOS.MacOS13.Xcode14	13m 23s
PSV.Linux.Android.22.04	5m 49s
PSV.iOS.MacOS13.Xcode15	13m 12s
PSV.Linux.22.04.gcc13	9m 37s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 37s
PSV.MacOS13.Xcode15.x86_64	5m 48s
PSV.Linux.22.04.gcc11	8m 32s
PSV.MacOS14.Xcode15	4m 0s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 50s
PSV.iOS.MacOS15.Xcode16	8m 10s
PSV.Clang.Format.Checker	34s
PSV.Linux.22.04.clang	9m 19s
PSV.iOS.MacOS14.Xcode15	5m 15s
PSV.Win.VC2022	11m 26s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 39s
PSV.Commit.Checker	8s
	2h 6m 55s

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