Use porting::optional in olp-cpp-sdk-read instead of boost::optional. #2025

Job	Run time
PSV.Linux.22.04.gcc9.Cpplint	8m 44s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 29s
PSV.Linux.22.04.gcc11	8m 40s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 35s
PSV.MacOS14.Xcode15	4m 36s
PSV.Linux.22.04.gcc13	8m 33s
PSV.Linux.Android.22.04	7m 17s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 48s
PSV.Win.VC2022	10m 10s
PSV.Clang.Format.Checker	48s
PSV.Commit.Checker	8s
PSV.iOS.MacOS15.Xcode16	7m 7s
PSV.Linux.22.04.clang	8m 46s
PSV.MacOS13.Xcode15.x86_64	4m 25s
PSV.iOS.MacOS13.Xcode15	13m 12s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 43s
PSV.iOS.MacOS13.Xcode14	14m 9s
PSV.MacOS15.Xcode16	2m 57s
PSV.iOS.MacOS14.Xcode15	5m 33s
	2h 3m 40s

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