Merged requested to merge fanf-dns-name-maxlabels into main
Some qp-trie operations will need to know the maximum number of labels in a name, so I wanted a standard macro definition with the right value.
Replace DNS_MAX_LABELS from <dns/resolver.h with DNS_NAME_MAXLABELS in <dns/name.h>, and add its counterpart DNS_NAME_LABELLEN.
Use these macros in
Fix an off-by-one error in an assertion in