Skip internal keys' lookup in LRU for the DefaultCache. (#1615) #1920

Job	Run time
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 21s
PSV.Linux.22.04.clang	8m 55s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 33s
PSV.Linux.22.04.gcc9.Tests.CodeCov	11m 32s
PSV.Linux.22.04.gcc9.Cpplint	8m 31s
PSV.Linux.22.04.gcc13	12m 2s
PSV.Linux.Android.22.04	5m 40s
PSV.MacOS14.Xcode15	4m 24s
PSV.MacOS15.Xcode16	4m 26s
PSV.Linux.22.04.gcc11	7m 42s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 22s
PSV.MacOS13.Xcode15.x86_64	4m 12s
PSV.iOS.MacOS13.Xcode14	11m 35s
PSV.iOS.MacOS13.Xcode15	11m 32s
PSV.iOS.MacOS14.Xcode15	6m 51s
PSV.Win.VC2022	10m 21s
PSV.iOS.MacOS15.Xcode16	5m 32s
PSV.Commit.Checker	0s
	2h 0m 31s

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