dnssec: structure for manipulating DNSKEY/CDS/RRSIG at once

Knot.files

src/knot/Makefile.inc

src/knot/dnssec/kasp/kasp_db.c

src/knot/dnssec/kasp/kasp_db.h

src/knot/dnssec/kasp/policy.h

src/knot/dnssec/key_records.c

src/knot/dnssec/key_records.h

src/knot/dnssec/zone-sign.c

src/knot/dnssec/zone-sign.h

src/utils/keymgr/offline_ksk.c