feat(`sol!`)!: gen unit/tuple structs for call types with 0/1 param #2357

Job	Run time
clippy	1m 11s
docs	55s
check no_std	43s
features stable	2m 14s
features stable --all-targets	3m 36s
fmt	15s
features nightly	2m 22s
miri --no-default-features	5m 47s
miri	5m 26s
features nightly --all-targets	4m 11s
test ubuntu-latest stable --no-default-features	1m 7s
wasm	33s
miri --all-features	8m 28s
test ubuntu-latest stable	1m 35s
test ubuntu-latest nightly --no-default-features	1m 9s
test ubuntu-latest nightly	1m 13s
test ubuntu-latest 1.81 --no-default-features	36s
test ubuntu-latest 1.81	35s
test windows-latest stable --no-default-features	3m 9s
test windows-latest stable	4m 2s
test windows-latest nightly --no-default-features	2m 50s
test windows-latest nightly	2m 36s
test windows-latest 1.81 --no-default-features	1m 50s
test windows-latest 1.81	1m 50s
test ubuntu-latest 1.81 --features json	36s
test windows-latest 1.81 --features json	1m 55s
test ubuntu-latest nightly --all-features	1m 23s
test windows-latest nightly --all-features	3m 10s
deny / cargo deny check	15s
ci success	2s
	1h 5m 34s

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