Use porting::optional in olp-cpp-sdk-read instead of boost::optional. #2008

Job	Run time
PSV.Linux.22.04.gcc9.Cpplint	8m 55s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 42s
PSV.iOS.MacOS13.Xcode14	11m 6s
PSV.MacOS13.Xcode15.x86_64	5m 38s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 17s
PSV.Linux.22.04.gcc13	9m 18s
PSV.Linux.Android.22.04	6m 53s
PSV.MacOS15.Xcode16	3m 17s
PSV.MacOS14.Xcode15	5m 33s
PSV.iOS.MacOS15.Xcode16	7m 30s
PSV.iOS.MacOS13.Xcode15	17m 47s
PSV.Linux.22.04.gcc11	7m 55s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 27s
PSV.Linux.22.04.clang	9m 9s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 53s
PSV.iOS.MacOS14.Xcode15	5m 39s
PSV.Commit.Checker	9s
PSV.Win.VC2022	10m 3s
PSV.Clang.Format.Checker	33s
	2h 8m 44s

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