Port ethabi json tests #727

Job	Run time
docs	52s
clippy	1m 22s
feature checks	3m 44s
fmt	28s
check WASM	41s
test stable --no-default-features	1m 58s
test stable	2m 5s
test stable --all-features	1m 48s
test beta --no-default-features	1m 14s
test beta	1m 29s
test beta --all-features	1m 22s
test nightly --no-default-features	1m 43s
test nightly	1m 24s
test nightly --all-features	1m 54s
test 1.65 --no-default-features	4m 38s
test 1.65	4m 12s
test 1.65 --all-features	4m 31s
	35m 25s

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