Double-buffering for JSON async stream #1745

Job	Run time
PSV.Linux.22.04.gcc11	7m 45s
PSV.Linux.20.04.gcc7.Cpplint	7m 42s
PSV.Linux.Android.20.04	5m 34s
PSV.Linux.20.04.clang	7m 26s
PSV.Linux.20.04.gcc7.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 7s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 24s
PSV.Linux.22.04.gcc13	10m 57s
PSV.Linux.22.04.gcc13.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 55s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 29s
PSV.Commit.Checker	5s
PSV.iOS.MacOS14.Xcode15	5m 43s
PSV.iOS.MacOS13.Xcode16	6m 17s
PSV.iOS.MacOS13.Xcode14	16m 45s
PSV.iOS.MacOS13.Xcode15	13m 55s
PSV.MacOS13.Xcode15.x86_64	4m 46s
PSV.MacOS13.Xcode15	1m 58s
PSV.MacOS14.Xcode15	5m 18s
PSV.MacOS13.Xcode16	4m 27s
PSV.Win.VC2019	9m 37s
	2h 7m 10s

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