GResolver: permit TLSA queries
Currently g_resolver_lookup_records_async() accepts as RRtype only values from: enum.ResolverRecordType: SRV, TXT, MX, NS, SOA.
I know that the RR TLSA has the number 52, but I do not know how to pass that 52=TLSA to GResolver.
Rationale: The existence of a TLSA record for a service means in terms of DANE, that for the protocol STARTTLS must be enforced. To determine whether STARTTLS must be enforced, the value of the TLSA record is not so relevant.