feat(syn-solidity): add even more Display impls #1031

Job	Run time
clippy	42s
feature-checks	3m 32s
docs	43s
fmt	16s
miri --no-default-features	4m 27s
test stable --no-default-features	1m 39s
miri	3m 33s
wasm	46s
test stable	1m 37s
miri --all-features	3m 59s
test stable --all-features	1m 41s
test beta --no-default-features	1m 44s
test beta	1m 35s
test beta --all-features	1m 44s
test nightly --no-default-features	1m 58s
test nightly	2m 19s
test nightly --all-features	2m 29s
test 1.65 --no-default-features	56s
test 1.65	58s
	36m 38s

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