Use porting::optional in olp-cpp-sdk-read instead of boost::optional. #2007

Job	Run time
PSV.Linux.22.04.gcc9.Cpplint	9m 17s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 3s
PSV.MacOS14.Xcode15	3m 48s
PSV.Linux.22.04.gcc11	9m 1s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 44s
PSV.Linux.Android.22.04	5m 59s
PSV.iOS.MacOS13.Xcode14	13m 4s
PSV.iOS.MacOS13.Xcode15	13m 2s
PSV.Linux.22.04.gcc13	12m 52s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 52s
PSV.MacOS15.Xcode16	4m 27s
PSV.Linux.22.04.clang	8m 47s
PSV.MacOS13.Xcode15.x86_64	4m 20s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 40s
PSV.Commit.Checker	5s
PSV.iOS.MacOS14.Xcode15	7m 33s
PSV.iOS.MacOS15.Xcode16	8m 16s
PSV.Win.VC2022	10m 46s
PSV.Clang.Format.Checker	41s
	2h 11m 17s

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