Use porting::optional in olp-cpp-sdk-read instead of boost::optional. #2006

Job	Run time
PSV.Linux.Android.22.04	5m 41s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 6s
PSV.MacOS13.Xcode15.x86_64	5m 59s
PSV.Linux.22.04.gcc9.Cpplint	8m 42s
PSV.Linux.22.04.gcc11	7m 56s
PSV.Linux.22.04.gcc13	8m 41s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 17s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 26s
PSV.Linux.22.04.clang	8m 51s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 43s
PSV.MacOS14.Xcode15	3m 17s
PSV.Win.VC2022	9m 45s
PSV.iOS.MacOS14.Xcode15	6m 44s
PSV.iOS.MacOS15.Xcode16	5m 58s
PSV.MacOS15.Xcode16	3m 1s
PSV.iOS.MacOS13.Xcode15	12m 50s
PSV.Clang.Format.Checker	32s
PSV.Commit.Checker	5s
PSV.iOS.MacOS13.Xcode14	10m 12s
	1h 56m 46s

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