refacto: clean `RevisionList` cursor structure #1680

Job	Run time
cargo-lint / cargo-dry-publish / publish	19s
cargo-lint / cargo-doc / doc	24s
cargo-lint / cargo-semver / Check semver	41s
cargo-lint / cargo-nursery-base / cargo-audit / Audit	3m 53s
cargo-lint / cargo-nursery-base / cargo-udeps / Check udeps	1m 39s
cargo-lint / cargo-nursery-base / cargo-lint / lint	2m 17s
cleanup	0s
cargo-publish	0s
	9m 13s

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