catalog: implemented generating from conf

doc/man/knot.conf.5in

doc/reference.rst

scripts/timerdb-info.py

src/knot/conf/schema.c

src/knot/conf/schema.h

src/knot/conf/tools.c

src/knot/events/handlers/load.c

src/knot/zone/catalog.c

src/knot/zone/catalog.h

src/knot/zone/timers.c

src/knot/zone/timers.h

src/knot/zone/zone.c

src/knot/zone/zone.h

src/knot/zone/zonedb-load.c

src/libdnssec/binary.c

src/libdnssec/binary.h

src/libdnssec/error.c

src/libdnssec/error.h

tests-extra/tests/zone/catalog_generate/test.py

tests-extra/tools/dnstest/server.py