Double-buffering for JSON async stream #1744

Job	Run time
PSV.Linux.20.04.gcc7.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 18s
PSV.Linux.22.04.gcc9.Tests.CodeCov	2m 55s
PSV.Linux.20.04.gcc7.Cpplint	4m 41s
PSV.Linux.20.04.clang	5m 26s
PSV.Linux.22.04.gcc11	5m 23s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 26s
PSV.Linux.22.04.gcc13	6m 55s
PSV.Linux.22.04.gcc13.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 39s
PSV.Linux.Android.20.04	5m 36s
PSV.iOS.MacOS13.Xcode16	4m 20s
PSV.iOS.MacOS13.Xcode14	8m 20s
PSV.iOS.MacOS13.Xcode15	12m 0s
PSV.MacOS13.Xcode15.x86_64	3m 51s
PSV.MacOS14.Xcode15	3m 44s
PSV.MacOS13.Xcode15	2m 21s
PSV.MacOS13.Xcode16	3m 59s
PSV.Commit.Checker	5s
PSV.iOS.MacOS14.Xcode15	4m 35s
PSV.Win.VC2019	9m 58s
	1h 31m 32s

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