feat: support legacy json abis #1062

Job	Run time
feature-checks	3m 21s
miri --no-default-features	3m 56s
miri	2m 51s
docs	30s
clippy	57s
miri --all-features	3m 18s
fmt	13s
test stable --no-default-features	1m 48s
wasm	38s
test stable	1m 28s
test stable --all-features	1m 28s
test beta --no-default-features	1m 44s
test beta	1m 18s
test beta --all-features	1m 31s
test nightly --no-default-features	1m 26s
test nightly	1m 26s
test nightly --all-features	1m 51s
test 1.65 --no-default-features	35s
test 1.65	39s
	30m 58s

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