feat: use `RevisionMap` to store `MasterPublicKey` subkeys #1647

Job	Run time
cargo-lint / cargo-doc / doc	29s
cargo-lint / cargo-dry-publish / publish	16s
cargo-lint / cargo-semver / Check semver	36s
cargo-lint / cargo-nursery-base / cargo-udeps / Check udeps	41s
cargo-lint / cargo-nursery-base / cargo-audit / Audit	6m 43s
cargo-lint / cargo-nursery-base / cargo-lint / lint	2m 30s
cargo-publish	0s
cleanup	0s
	11m 15s

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