add a benchmark for JSON where errors are not generated #1009

Job	Run time
Test minimal rust version	18s
Bench	50s
Build documentation	1m 7s
Coverage	50s
Check formatting	11s
Test (stable)	53s
Test (beta)	45s
Test (nightly)	41s
Test (1.65.0)	50s
Test (stable, --features "std")	48s
Test (stable, --no-default-features)	42s
Test (stable, --no-default-features --features "alloc")	43s
Test (nightly, --no-default-features)	40s
Test (nightly, --no-default-features --features "alloc")	45s
	10m 3s

Provide feedback