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GH-50567: [C++] Introduce JsonWriter and migrate integration JSON writer #4398

Job	Run time
check-labels / Check labels	5s
check-enabled	4s
Rhub GCC 15 with LTO	51m 56s
Rocker R-ver - Minimal	21m 0s
Rocker R-ver - Offline build	20m 53s
Rocker R-ver - Bundled Dependencies	34m 17s
RStudio R-Base 4.5	31m 20s
Rhub	48m 58s
Rocker R-ver	35m 4s
report-extra-cpp	0s
	4h 3m 37s