Refactor PartitionsSaxHandler to use boost::json #2223

Job	Run time
PSV.Linux.22.04.gcc11	8m 55s
PSV.Linux.22.04.gcc9.Cpplint	9m 1s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 57s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 53s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 53s
PSV.Linux.22.04.gcc11.OLP_SDK_NO_EXCEPTION=ON	7m 14s
PSV.Linux.22.04.clang	9m 32s
PSV.Linux.24.04.gcc13.Tests	8m 9s
PSV.Win.VC2022	11m 44s
PSV.iOS.MacOS14.Xcode15.ARM64	5m 36s
PSV.Clang.Format.Checker	36s
PSV.Commit.Checker	7s
PSV.Linux.Android.22.04	7m 42s
PSV.MacOS15.Xcode16.ARM64	8m 28s
PSV.iOS.MacOS15.Xcode26.ARM64	5m 45s
PSV.iOS.MacOS15.Xcode16.ARM64	5m 35s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 56s
	1h 48m 3s

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