Fix packages base uri and introduce a console for that base uri master
Summary: The packages base uri is /packages/. Previously, the base uri pointed to the packages search engine. Because that prevents navigating to the publishers search engine and the versions search engine and because the new base uri is a 404, add a console, similar to Almanac or Nuance to link to these endpoints. This makes the forms for publishers and versions accessible without manually navigating there. Test Plan: * Clicked on the Packages application in Applications and saw a Console * Clicked on the options in the console and saw all search engines * Clicked on the packages crumb and got sent to the console * Created a package and clicked on Edit Package and didn't see a 404 Reviewers: O1 Blessed Committers, aklapper Reviewed By: O1 Blessed Committers, aklapper Subscribers: aklapper, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno Differential Revision: https://we.phorge.it/D25881