Skip internal keys' lookup in LRU for the DefaultCache. #1895

Job	Run time
PSV.Linux.22.04.gcc9.Cpplint	8m 18s
PSV.Linux.22.04.gcc9.Tests.CodeCov	5m 30s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 14s
PSV.Linux.22.04.gcc11	8m 18s
PSV.Linux.22.04.gcc13.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	6m 19s
PSV.Linux.Android.22.04	5m 30s
PSV.MacOS13.Xcode15.x86_64	3m 58s
PSV.MacOS14.Xcode15	6m 33s
PSV.MacOS13.Xcode16	7m 0s
PSV.Linux.22.04.gcc13	12m 35s
PSV.iOS.MacOS13.Xcode14	14m 19s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 8s
PSV.Linux.22.04.clang	8m 47s
PSV.Win.VC2019	8m 44s
PSV.iOS.MacOS13.Xcode15	12m 40s
PSV.Commit.Checker	9s
PSV.iOS.MacOS14.Xcode15	7m 7s
PSV.iOS.MacOS13.Xcode16	6m 8s
	2h 6m 17s

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