contrib: move wire_ctx from internal

Knot.files

src/Makefile.am

src/contrib/wire_ctx.h

src/knot/conf/conf.c

src/knot/conf/confdb.c

src/knot/conf/tools.c

src/knot/dnssec/nsec3-chain.c

src/knot/zone/timers.c

src/libknot/dnssec/rrset-sign.c

src/libknot/packet/pkt.c

src/libknot/packet/rrset-wire.c

src/libknot/rrset-dump.c

src/libknot/rrtype/naptr.c

src/libknot/rrtype/opt.c

src/libknot/rrtype/tsig.c

src/libknot/yparser/ypscheme.h

src/libknot/yparser/yptrafo.c

src/utils/common/exec.c

tests/wire_ctx.c