The presentation format for RFC9460 SVCB/HTTPS RR types allows for
parameter values to be quoted. The code for processing parameter values
in hickory-dns had a comment indicating quotes should have been
stripped, but this wasn't occurring in practice.
This commit updates the parsing logic to perform the mentioned quote
stripping, and updates the unit tests with fresh data found from doing
`HTTPS` lookups for `google.com` and `crypto.cloudflare.com`. Notably
both of these show quoted strings in `dig`'s presentation format output
and so were sufficient to tickle the bug fixed above.