Expand the list of the priority types and move it to db_p.h

Expand the list of the priority types and move it to db_p.h

Add HTTPS, SVCB, SRV, PTR, NAPTR, DNSKEY and TXT records to the list of
the priority types that are put at the beginning of the slabheader list
for faster access and to avoid eviction when there are more types than
the max-types-per-name limit.