Use porting::optional in olp-cpp-sdk-write instead of boost::optional. #2000

Job	Run time
PSV.Linux.22.04.gcc9.Cpplint	9m 2s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 19s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 6s
PSV.Linux.22.04.gcc11	9m 17s
PSV.Linux.22.04.gcc13	12m 8s
PSV.Linux.22.04.clang	9m 17s
PSV.MacOS13.Xcode15.x86_64	5m 3s
PSV.Linux.Android.22.04	5m 58s
PSV.MacOS14.Xcode15	3m 28s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 43s
PSV.MacOS15.Xcode16	5m 26s
PSV.iOS.MacOS15.Xcode16	8m 55s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 58s
PSV.iOS.MacOS13.Xcode15	12m 19s
PSV.iOS.MacOS13.Xcode14	10m 26s
PSV.iOS.MacOS14.Xcode15	5m 41s
PSV.Commit.Checker	8s
PSV.Win.VC2022	9m 50s
PSV.Clang.Format.Checker	41s
	2h 7m 45s

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