feat: add doc strings getter to `FullABIFunction` #46

Job	Run time
cancel-previous-runs	2s
cargo-verifications (fmt, --all --verbose -- --check)	14s
cargo-verifications (clippy, --all-targets --all-features)	18s
cargo-verifications (check, --all-targets)	19s
cargo-verifications (check, --all-targets --all-features)	13s
cargo-verifications (test, --all-targets --all-features)	32s
cargo-verifications (test, --all-targets --no-default-features)	31s
publish	0s
	2m 9s

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