rename olp/porting/optional.hpp into optional.h #2010

Job	Run time
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 22s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 47s
PSV.Linux.22.04.gcc9.Cpplint	9m 13s
PSV.Linux.22.04.gcc11	8m 47s
PSV.iOS.MacOS13.Xcode14	9m 45s
PSV.MacOS14.Xcode15	3m 39s
PSV.iOS.MacOS13.Xcode15	10m 10s
PSV.Linux.22.04.gcc13	9m 0s
PSV.MacOS15.Xcode16	4m 10s
PSV.MacOS13.Xcode15.x86_64	3m 49s
PSV.Linux.22.04.clang	9m 4s
PSV.Linux.Android.22.04	6m 16s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 22s
PSV.Win.VC2022	10m 27s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 49s
PSV.Commit.Checker	6s
PSV.Clang.Format.Checker	30s
PSV.iOS.MacOS15.Xcode16	7m 11s
PSV.iOS.MacOS14.Xcode15	8m 8s
	2h 0m 35s

Provide feedback