chore(json-abi): clean up utils (#794) #2130

Job	Run time
test ubuntu-latest stable --no-default-features	1m 15s
test ubuntu-latest stable	1m 16s
test ubuntu-latest nightly --no-default-features	5m 56s
features stable	2m 17s
test ubuntu-latest nightly	46s
features stable --all-targets	3m 31s
test ubuntu-latest 1.79 --no-default-features	41s
test ubuntu-latest 1.79	43s
features nightly	1m 39s
test windows-latest stable --no-default-features	2m 20s
features nightly --all-targets	2m 50s
test windows-latest stable	2m 25s
miri --no-default-features	5m 1s
test windows-latest nightly --no-default-features	2m 2s
wasm	40s
miri	4m 37s
test windows-latest nightly	1m 59s
check no_std	51s
miri --all-features	7m 27s
test windows-latest 1.79 --no-default-features	1m 31s
clippy	50s
test windows-latest 1.79	1m 29s
docs	31s
test ubuntu-latest 1.79 --features json	36s
test windows-latest 1.79 --features json	1m 46s
fmt	12s
test ubuntu-latest nightly --all-features	1m 17s
test windows-latest nightly --all-features	2m 45s
	59m 13s

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