refactor(lisp/dns): Introduce structured QNAME representation

Adds a struct that represents QNAMEs, tracks the stream offset at
which the QNAME parsing began and makes it possible to resolve
pointers inside of the QNAME.

Note that resolving pointers needs to happen *after* the call to
lisp-binary currently. It might be possible to implement this inside
of lisp-binary in the future by switching on the top two bits of the
qname field, but since this is happening *inside* of a reader function
I'm not currently sure how to implement it.

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