extend the JSON benchmark

[Geal]

this adds a benchmark using a larger file, and compares the results with two different error types

[coveralls]

Pull Request Test Coverage Report for Build 4167753547

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 10 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.3%) to 61.912%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
benchmarks/benches/json.rs	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/character/complete.rs	1	81.12%
src/character/streaming.rs	1	78.38%
benchmarks/benches/json.rs	8	0%

Totals
Change from base Build 3981619336:	-0.3%
Covered Lines:	1554
Relevant Lines:	2510

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💛 - Coveralls