chg: dev: Unify parsing of query-source and other X-source options

The query-source option currently allows the address to be specified in two ways, either as every other X-source option, or as an
"address" key-value pair.
This merge request extends the `parse_sockaddrsub` config parsing function so that it can parse the query-source option. It also removes the separate config parsing function for `query-source`.

Closes #4961

Merge branch '4961-query-source-parsing-refactor' into 'main'

See merge request isc-projects/bind9!9551