[FastAPI] Add /packages/{name} and /pkgbase/{name} routes
Based off of @artafinde's MR, this MR finishes translation and complete implementation of the the following routes:
/packages/{name}
/pkgbase/{name}
This MR does not implement action routes, but purely the individual "show" routes for a package or pkgbase.
Both of these routes are coupled in this MR because /pkgbase/{name}
reuses most of the templates implemented in /packages/{name}
, so the pkgbase portion ends up being quite small.
Edited by Kevin Morris