Refactor PartitionsSaxHandler to use boost::json #2238

Job	Run time
PSV.Linux.22.04.gcc9.Cpplint	9m 5s
PSV.Linux.22.04.gcc11.OLP_SDK_NO_EXCEPTION=ON	7m 6s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 48s
PSV.Linux.22.04.gcc11	8m 37s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 2s
PSV.MacOS15.Xcode16.ARM64	5m 2s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 2s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	4m 41s
PSV.Linux.22.04.clang	8m 55s
PSV.Linux.24.04.gcc13.Tests	8m 1s
PSV.Win.VC2022	10m 11s
PSV.iOS.MacOS14.Xcode15.ARM64	7m 37s
PSV.Commit.Checker	8s
PSV.Clang.Format.Checker	33s
PSV.iOS.MacOS15.Xcode26.ARM64	6m 6s
PSV.iOS.MacOS15.Xcode16.ARM64	8m 40s
PSV.Linux.Android.22.04	8m 9s
	1h 48m 43s

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