changesets: Partial port to changeset with tries.

src/common/hattrie/hat-trie.h

src/knot/dnssec/nsec-chain.c

src/knot/dnssec/zone-sign.c

src/knot/nameserver/ixfr.c

src/knot/nameserver/update.c

src/knot/server/journal.c

src/knot/server/journal.h

src/knot/server/serialization.c

src/knot/updates/changesets.c

src/knot/updates/changesets.h

src/knot/updates/ddns.c

src/knot/zone/zone-diff.c