feat: JSON bindings #67

Job	Run time
feature-checks	25s
miri --no-default-features	42s
miri	39s
test stable --no-default-features	17s
clippy	17s
miri --all-features	52s
test stable	17s
wasm	14s
docs	16s
fmt	11s
test stable --all-features	23s
test beta --no-default-features	17s
test beta	13s
test beta --all-features	22s
test nightly --no-default-features	14s
test nightly	12s
test nightly --all-features	33s
test 1.65 --no-default-features	20s
test 1.65	12s
	6m 56s

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