libknot: move lookup_table as knot_lookup from contrib

Knot.files

src/Makefile.am

src/knot/conf/scheme.c

src/knot/conf/scheme.h

src/knot/modules/synth_record.c

src/knot/nameserver/axfr.c

src/knot/nameserver/ixfr.c

src/knot/nameserver/notify.c

src/knot/nameserver/process_query.c

src/libknot/codes.c

src/libknot/codes.h

src/libknot/libknot.h

src/libknot/lookup.h

src/libknot/rrset-dump.c

src/libknot/yparser/ypscheme.c

src/libknot/yparser/ypscheme.h

src/libknot/yparser/yptrafo.c

src/libknot/yparser/yptrafo.h

src/utils/common/exec.c

src/utils/knsupdate/knsupdate_exec.c