rename olp/porting/optional.hpp into optional.h #2011

Job	Run time
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 56s
PSV.Linux.22.04.gcc9.Tests.CodeCov	11m 4s
PSV.Linux.22.04.gcc11	8m 40s
PSV.Linux.22.04.gcc9.Cpplint	8m 47s
PSV.Linux.22.04.clang	9m 7s
PSV.Linux.Android.22.04	6m 14s
PSV.iOS.MacOS15.Xcode16	8m 52s
PSV.Commit.Checker	5s
PSV.iOS.MacOS13.Xcode15	9m 50s
PSV.Clang.Format.Checker	37s
PSV.MacOS14.Xcode15	3m 38s
PSV.Win.VC2022	9m 40s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 24s
PSV.MacOS15.Xcode16	6m 52s
PSV.iOS.MacOS14.Xcode15	4m 58s
PSV.Linux.22.04.gcc13	8m 28s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 55s
PSV.MacOS13.Xcode15.x86_64	5m 51s
PSV.iOS.MacOS13.Xcode14	16m 34s
	2h 8m 32s

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