Double-buffering for JSON async stream #1746

Job	Run time
PSV.Linux.20.04.gcc7.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 2s
PSV.Linux.22.04.gcc11	8m 5s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 6s
PSV.Linux.20.04.gcc7.Cpplint	7m 45s
PSV.Linux.22.04.gcc13	8m 10s
PSV.Linux.22.04.gcc13.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 38s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 30s
PSV.Linux.Android.20.04	4m 59s
PSV.iOS.MacOS13.Xcode15	10m 26s
PSV.Linux.20.04.clang	7m 21s
PSV.MacOS13.Xcode15.x86_64	3m 59s
PSV.MacOS13.Xcode15	1m 56s
PSV.MacOS14.Xcode15	2m 41s
PSV.MacOS13.Xcode16	3m 54s
PSV.Commit.Checker	7s
PSV.iOS.MacOS14.Xcode15	6m 8s
PSV.iOS.MacOS13.Xcode16	5m 17s
PSV.iOS.MacOS13.Xcode14	13m 39s
PSV.Win.VC2019	8m 50s
	1h 50m 33s

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