Add Archived Field to "List public repositories" Endpoint

[bmarcaur]

The repositories api has an endpoint which lists all the information about public repositories. This endpoint does not return any information about the archived status of the repo. However, it has many sibling endpoints (e.g. org focused) which does include the archived status. This omission is leading to pain while attempting to index all of our repositories in to Sourcegraph. You can see the Sourcegraph maintainers come to a similar conclusion here. By default, Sourcegraph omits results from archived repos. This feature is completely negated by this missing information as it causes all repos to be treated as if they were not archived. The ask here is to include this additional archived flag in the "list public repositories" query.