This adds a new child resource off the HostingServiceAccount resource

for querying remote repositories.
Since every hosting service works differently, this resource needs to

take different query parameters depending on the hosting service it's

querying. Specifically, the owner-type= and filter-type= values.

Tested this with valid and invalid repositories on GitHub.
Tested different possible values for owner_type and filter_type.
Unit tests pass.
Built docs and saw that they looked correct (though, examples and links

have to be turned off, since we don't have DB-backed state to generate

from).